** released v0.26 **
5/6/8 - remove trailing ',' from rows in eq cct file saves
5/6/8 - change header line in eq cct file saves from ID to ident to avoid 'SYLK' import errors in excel
12/6/8 - alter leftview.cpp so that transverter[0] settings changed when action may have changed min and max (otherwise they are not saved on program exit)
** v0.26a to Jerry **
12/6/8 - put marker data into status bar when dragging manual marker
** v0.26b to Jerry **
12/6/8 - add option to invert RL (TODO: make default units invert)
15/6/8 - added info tips to left view plus option to switch on/off in display options
15/6/8 - added cursor location in status bar when not dragging
15/6/8 - added RedrawWindow() to start and end of the eq cct refine solution code to clean up display
15/6/8 - alter units default on Rl invert (but does not immediately take effect)
** v0.26c to Jerry **
19/6/8 - added initial part of harmonic modes
** v0.26d to Paul **
19/6/8 - check if scanning when changing scan points and abort scan in progress first
19/6/8 - added nHarmonic to document & made sweep time display change on harmonic sampling mode
19/6/8 - corrected bug in marker display that detached markers from trace if window height changed
22/6/8 - corrected bugs in harmonic modes and reflected in onscreen display of mode
23/6/8 - added harmonic modes to usb code
23/6/8 - corrected slider positioning and RF initial frequency setting in signal generator
23/6/8 - corrected crash bug when manual marker off screen and sweep type changed
24/6/8 - make sure min freq span when dragging is one dds step frequency times number of scan points and axis does not reverse left / right
27/6/8 - changing source, mode or target in a marker enables that marker
29/6/8 - locking vertical axes now stops autoscale and display type changes rescaling
29/6/8 - added refine solution option to 6 term crystal eq cct measurement
** release as v0.27 **
05/07/08 - added switch and attenuator setting functions
05/07/08 - change logic to enable ADC speed to be changed during a scan
** release as v0.27a to Mike Collins to check switch & atten modes **
05/07/08 - hide switch 1 when using parallel mode
17/07/08 - replace print title page dialog with print notes window
** release as v0-27b to Robert Cerreto to check concept of print notes
19/07/08 - corrected bug in autoscale when switching mode (transmission/reflection)
19/07/08 - changed print format for status bar cursor data from %f to %g
19/07/08 - modified print page layout calculations
20/07/08 - lock display type when in equivalent circuit mode
20/07/08 - autoscale snap to 1/2/5 sequence now snaps to 45 if displaying degrees and value is 50 per division
20/07/08 - wait for scan thread termination on closing document
22/07/08 - allow notes dialog to resize
** release as v0-28 **
29/07/08 - changed method of calculation of reflection results from Z to rho
29/07/08 - added correction for calibration standard offsets
29/07/08 - added S parameter methods
29/07/08 - misc small bug fixes following on from S parameter changes
29/07/08 - added phase step delay funtion to USB and parallel handlers and scan structure but not to main program yet
14/08/08 - added diagnostic screen
14/08/08 - extended S mode to 5/6/10/12 term
14/08/08 - fixed up calibration data load save for reverse scan data
14/08/08 - misc bug fixes
** release as v0-29 **
14/08/08 - corrected bug in checking if calibration data valid for sweep and deleted old commented out code
17/08/08 - added phase change step delay
17/08/08 - moved average count to hardware node
21/08/08 - corrected same ADC lockup bug in calibrate scan in USB moe
21/08/08 - took phase step delay count into account in scan time calculation
21/08/08 - restructured S parameter display options
21/08/08 - added flags to extend ERC into reflection & transmission
28/08/08 - significant internal change - details omitted. Complete rewrite of s parameters mode
28/08/09 - stop mode change to signal generator or degug whilst scanning from crashing pgm
** release 0.29a to Mike **
29/08/08 - added VNA4win file format save and corrected headers in myVNA file format
05/09/08 - more changes to S parameters
05/09/08 - changed frequency entry in hardware section to MHz
05/09/08 - chnaged min scan steps to 2
** release as 0.30 to Mike **
07/09/08 - added extended file save function
07/09/08 - added options dialog. Set limits, enable / disable net, atten, transverter options
14/09/09 - reworked frequency setting dialog
14/09/08 - added RFIV mode
** release as 0.30c to Paul
14/09/08 - changed delays in parallel to not call sleep in <= 1 ms
** release as 0.30d to Tom
14/09/08 - added option to use winio
** release as 0.30e to Tom and Paul
19/09/08 - tweaked parallel code to defer scans optionally uitil dialog boxes shown
19/09/08 - added control for ADC timeout to hardware interface selection
19/09/08 - tweak autoscale to better the fit in 1/2/5 autoscale calculations
** release as 0.30f to Paul
19/09/08 - do not show 'no cal loaded' dialog on startup until a calibration has been completed
19/09/08 - added error messages for frequency range exceeds calibration data range
02/10/08 - created usb drivers 0.22 and made program check version
02/10/08 - new version of vnadll.dll for version number management
02/10/08 - rewrite of usb scan code to add rfiv
02/10/08 - modified scan logic for multiple minor bugs & issues following above changes
02/10/08 - make code force RC and reflection mode in RFIV
02/10/08 - modify calibration handler to show ratio not voltage in rfiv cal
02/10/08 - make calibration idle frequency mid scale of range not lowest frequency for offset problem
** release as 0.31 to Paul **
05/10/08 - enforce match of RFIV calibration with scan and save in scandata flags
06/10/08 - correct from zero scan of UpdateTraceInProgress() and in dragging trace and in marker positioning
12/10/08 - add copy to report view for selected rows or whole data set
12/10/08 - permit rows to be swapped in report view
12/10/08 - add copy to equivalent circuit display
12/10/08 - added keyboard accelerators T,S,C,A,M for buttons on scan toolbar
13/10/08 - update calibration process (set wait freq to start or centre, display it) + bug fixes to dual scan
** release as 0.32 **
20/10/08 - block combination of Basic mode and 5/10 term calibration following Mark marsden's feedback
22/10/08 - correct calibration data calculation bug that stopped transmission mode working
** release as 0.33 **
23/10/08 - yet another stupid bug
** release as 0.34 **
01/11/08 - added log scan mode and reworked log display code throughout to match
01/11/08 - corrected bug in dual scan calibration to offer ISO step choice
01/11/08 - remove bug that locks display types when switching to report view from equivalent circuits
** release as 0.35 **
01/11/08 - corrected status line frequency display
** release as 0.36 **
03/11/08 - tweak to log / lin file detection in loading trace data from disk
** test version 0.36a to Paul Playford **
04/11/08 - force lin scan mode in calibration
** test version 0.36b to Mori **
** release as 0.37 **
16/11/08 - added polar mode code and restructured quite a bit to match !!!
16/11/08 - changed prompts for calibration to match 'Start' button
16/11/08 - added Touchstone file save format for reflection and S parameters
** release as 0.37a,b with bug fixes **
21/11/08 - add drag & drop for cal files and stored data files
22/11/08 - extended drag & drop to ref files and corrected bug in loader that meant it stopped after 1st parameter read
22/11/08 - set title to show mode
22/11/08 - corrected calculation of L and C for log scans
** release as 0.37d to Mori **
23/11/08 - tweaked layout of strings in polar views.Save polar view mode in registry.
** release as 0.38 **
24/11/08 - change file load / save touchstone formats and add dialog box to choose format on save
24/11/08 - correct bug in debugIO that caused lockup on parallel port
24/11/08 - correct clip region bug that obscured trace on maximise window
29/11/08 - added log vertical scale function
** release as 0.39 **
??/12/08 - changed file save to align columns
** release as 0.39a to Paul **
13/12/08 - fundamental restructure to permit multiple traces on screen
13/12/08 - fix S parameter calibration data crystal eq cct refine code bug
13/12/08 - add option to suppress display sets 
13/12/08 - increase number of trace colours
20/12/08 - copy to clipboard in report format now includes csv
20/12/08 - added unguided calibration
** release as 0.39b to Eric, Andreas, Paul, Harold **
23/12/08 - add column clipboard copy function to report view
23/12/08 - add copy function to main display popup menu
23/12/08 - add auto attenuator setting function
23/12/08 - correct bug in auto refine printing function
23/12/08 - correct null pointer bugs when display sets is removed
01/01/09 - enable multiple stores to be displayed at same time
01/01/09 - add stored traces to report view and extend column copy
01/01/09 - remove leading and trailing whitespace from column copy in report view
02/01/09 - added log calibration scan support (lots of small changes)
04/01/09 - added curve fitting to calibration data interpolation
** released as 0.39c-i for testing - various bug fixes **
04/01/09 - block frequency axis dragging when scanning and add option to switch on or off
04/01/09 - complete coding of mode switch to / from polar in selection of display types
04/01/09 - rename Gamma as smith chart in display types
04/01/09 - add right click menu command to main display to set frequency scan to display settings
09/01/09 - change AngleArc() to Arc() in smith chart plotting for W98 compatibility
10/01/09 - bug fixes from Paul - marker positioning etc
10/01/09 - added decimal point control for frequencies in marker dialog
10/01/09 - enable print notes in clipboard copy of main view graphic traces (only)
10/01/09 - added control over number of decimal places to set frequency axis dialog
10/01/09 - force print of equivalent circuit in clipboard and on printout
** released as 0.40 **
17/01/09 - redrafted calibration scan processing and checking following bug found by Mike
17/01/09 - bug fix to curve fitting in interpolation
17/01/09 - use memory device context and BitBlt to remove flicker
17/01/09 - bug fixes to divide by zero in parameter calulations
17/01/09 - tweaked display messages for calibration
18/01/09 - tweaked checking on calibration data in several places
18/01/09 - changed way that markers are dragged in polar view
18/01/09 - added more detail to calibration data summary and to display in unguided calibration
** v0.41 rc4 **
** v0.42 **
04/02/09 - added option to label markers in printout
04/02/09 - added OnSize function to force clear of screen on maximise (kludge)
04/02/09 - clip markers to edge of rectangular display within DisplayMarkers()
04/02/09 - tweak configure function to correct display type selection on changes that prevented manual scaling of axis
26/02/09 - correct bugs to display routines
26/02/09 - add option for labels and annotations
04/02/09 - added tcpip client / server code
14/03/09 - add option to unlink display from scan in rectangular mode
** release as v0-44 **
19/03/09 - added cursors function
20/03/09 - corrected bug in USB and TCPIP interface speed change during scan
05/04/09 - change default max display from from 200 Hz to 200 MHz
05/04/09 - added VVM and restructured phase sequence in parallel drivers
09/04/09 - modified unguided calibration to display extra data and clear ISO if skip is ticked when thru is valid
09/04/09 - modified usb drivers to change phase sequence for VVM
12/04/09 - modified tcpip code to work with VVM
19/04/09 - added VVM calibration function
19/04/09 - modified code to show first / last points in a scan correctly
19/04/09 - modified code to show markers in stored traces 3 & 4
19/04/09 - modified code to work on W2K by removing IP address lookup in net server (getpeernameex())
19/04/09 - add option to force DDS idle to scan start in calibration
21/04/09 - removed abs() from C & L calculations, removed Zp and altered Q to make sign depend on sign of Rs
24/04/09 - added option to force absolute values in log vertical axes
28/04/09 - restructured all scan routines to add 2/4th harmonic filtering
01/05/09 - added single detector mode to VVM
01/05/09 - corrected display options bug and prompt in set frequency dialog
16/05/09 - added trace calculation mode
25/05/09 - rewrote polar display functions to support calculation modes
25/05/09 - added function to change value shown for markers in smith view
25/05/09 - added option to show all display modes at once
06/06/09 - added dds power down mode
** release as v0-45 **
06/07/09 - added network simulation
06/07/09 - fixed bug in crystal refine caused by equation mode (null pointer)
23/07/09 - fixed bug in parallel drivers for 32 sample processing (buffer problem)
23/07/09 - added limits checking to dft filter
24/07/09 - fix integer calculation bug in gridline calculations
24/07/09 - add option to display reflection data for port 2
25/07/09 - add frequency axis decimal points to display frequency dialog box (unlocked version)
25/07/09 - restructure load/store options to add support for simulation and saving stores to file
25/07/09 - modify clip region display logic to improve clipboard copy / printout clipping of trace
30/07/09 - add OSLC calibration option
30/07/09 - make simulation use forward scan data in both directions in the event of no reverse scan data
08/09/09 - correct tan(x) bug in 45 degree crystal measurement
08/09/09 - restrict ability to refine whilst scan in progress in crystal measurement
08/09/09 - include button to reset autonumber in eq cct logging
08/09/09 - add 'simulate' button to eq cct mode
08/09/09 - modify code to allow sig gen and debug IO to run as dialogs not modal dialogs so they may be minimised properly
20/08/09 - add nudge controls to network synthesis dialogs and cure memory leak.
30/09/09 - added LLC computations in calibration
30/09/09 - add options to save cal standards in calibration data (file format 6 added)
01/10/09 - change lists simple droplists to avoid keyboard mis selection
01/10/09 - make notes headers / footers persistent in registry
01/10/09 - add tooltips
01/10/09 - tweak net sim dialog - update button, set focus, select edit text
03/10/09 - add scroll wheel nudge to network simulation dialogs
11/10/09 - added group delay
11/10/09 - added termination impedance for simulation
14/10/09 - modify reset sequences for usb
** release as 0.49 **
23/10/09 - add options to label gridlines vertical & horizontal
23/10/09 - change long to __int64 in dds handling
03/11/09 - added Ref Mode config screen
03/11/09 - tweaked net simulation descriptions (first 2 were incorrectly described)
18/11/09 - label markers in clipboard copy as well as in printout if option selected
18/11/09 - add trap in ProcessMarkers() to stop crash when switching to polar
28/12/09 - add option to drag labels in rectangular display and menu option to reset positions
??/11/09 - correct stored trace bug to allow stored traces to be hidden
01/01/10 - add trap for divide by zero in network simulation by adding 1e-99
01/01/10 - add short for reflection mode simulation of crystal
** release as v0-50 **
08/01/10 - add option to track markers with offset value
10/01/10 - add interpolation code for markers for value crossing and linked offset markers
10/01/10 - add option to display Q in marker calculation
21/02/10 - rewrite s parameter code, ref mode etc to make ref mode work properly
01/03/10 - rewrite rfiv mode
02/04/10 - modify ABCD class to include S parameter functions as inline code
01/05/10 - modify help functions to load chm version of quickstart
01/05/10 - add new toolbar for right click main menu fucntions
01/05/10 - add warning dialogs code and make one appear on rfiv for transmission mode
01/05/10 - add calibration option to use 10 term methods with 5 term data
01/05/10 - modify parallel port scan for new ref/rfiv methods
** test build v0-51 **
09/05/10 - modify display options so that not all rescale the display
09/05/10 - make file/open load scan data to a store
03/06/10 - modify code to clean up pending reads of ADC in USB scan and switch off DDS load during ADC read in Collect_Readings()
06/06/10 - make marker display on boundary of rectangular display area
06/06/10 - add option to hide current scan data in graphical display
06/06/10 - correct bug in hide / display stored trace data
** test build v0-52 **
25/06/10 - add option to label rect display freq / division to set frequency axis dialogs
25/06/10 - added button to set display to current scan and add to context menu
25/06/10 - separate calibration averages per point from scan averages and move from hardware
28/06/10 - add options to set scan to file data when loaded to a store 
28/06/10 - add option to set scan to current store parameters
28/06/10 - rewrite cal file load/save to add notes and define new file header block structure
01/07/10 - add per step and per division options to scan settings
01/07/10 - add full screen support
** release as 0.54 ***
??/??/?? - extend to 9 markers
??/??/?? - include MSA support (partial)
??/??/?? - split hardware type into separate dialog
??/??/?? - add stored trace auto save/load
??/??/?? - separate display & print options into separate controls
??/??/?? - add printer font control
??/??/?? - Add TDR modes
??/??/?? - Add trace average control
??/??/?? - Add marker measurements functions
??/??/?? - Add ability to save / load program configuration
??/??/?? - Add display mode toolbar
??/??/?? - Correct toolbar position control & add menu option to hide / show
** release as test build 0.60 **