Update readme

Installers/README.txt

@@ -3,59 +3,51 @@
 
 Only 64 bit versions of Windows 10 and later are supported in this release.
 
-Changes since the last release:
+This is a bug fix release for problems reported against 5.1.0, 5.1.1, 5.1.2
 
-1. Bug fix - correct problems with drag drop of a directory.
-
-2. Enhancement - if Custom Rectangle mode is read from a filelist or settings file, switch to Intersection mode.
-
-3. Bug fix - correct handling of reference frame in filelist.
-
-4. Bug Fix - FITS/DDP choice of Camera was not being handled correctly.
+1. Possible bug fix - DeepSkyStacker terminated at startup when running on ARM version of Windows 11 in x64 emulation mode.  Unable to test.
 
-Welcome to DeepSkyStacker 5.1.2
-===============================
+2. Bug fix - A corrupt info.txt file caused an infinite loop.
 
-Only 64 bit versions of Windows 10 and later are supported in this release.
+3. Diagnostic added - Report processor architecture and processor type in trace file and to stderr at startup.
 
-This is a bug fix release for problems reported against 5.1.0 and 5.1.1
+4. Bug fix - Stacked FITS images in SuperPixel mode were displayed only in the top left corner.
 
-1. Bug fix - correct handling of file types (TIFF/FITS) in DeepSkyStackerCL for intermediate and final files
+5. Bug fix - Resolve occasional odd problems when using edit stars mode.
 
-2. Bug fix - correct handling of Stacking Mode (Standard/Mosaic/Intersection/Custom)
+6. Bug fix - DeepSkyStackerCL was only displaying the help text regardless of command line input.
 
-3. Bug fix - unable to select a custom rectangle immediately after opening image file
+7. Enhancement - Reinstate Image Properties as a Qt based dialogue to allow changing e.g. exposure for multiple images at once
 
-4. Bug fix - fileids in filelist files were being incorrectly written as ANSI not UTF8
+8. Bug fix - Fields in the image list and the group tabs were not updated when switching to another language.
 
-5. Bug fix - the selection for a custom rectangle was not always visible
+9. Bug fix - remove all "Set Black Point to Zero" recommendations from "Recommended Settings"
 
-6. Enhancement - reduce the minium size for the image list to be two rows
+10. Bug fix - Invalid input in RAW/DDP settings for scale factors caused an assertion failure
 
-Welcome to DeepSkyStacker 5.1.1
-===============================
+11. Bug fix - correct handling of file types (TIFF/FITS) in DeepSkyStackerCL for intermediate and final files
 
-This is a bug fix release for problems reported against 5.1.0
+12. Bug fix - correct handling of Stacking Mode (Standard/Mosaic/Intersection/Custom)
 
-1. Possible bug fix - DeepSkyStacker terminated at startup when running on ARM version of Windows 11 in x64 emulation mode.  Unable to test.
+13. Bug fix - unable to select a custom rectangle immediately after opening image file
 
-2. Bug fix - A corrupt info.txt file caused an infinite loop.
+14. Bug fix - fileids in filelist files were being incorrectly written as ANSI not UTF8
 
-3. Diagnostic added - Report processor architecture and processor type in trace file and to stderr at startup.
+15. Bug fix - the selection for a custom rectangle was not always visible
 
-4. Bug fix - Stacked FITS images in SuperPixel mode were displayed only in the top left corner.
+16. Enhancement - reduce the minimum size for the image list to be two rows
 
-5. Bug fix - Resolve occasional odd problems when using edit stars mode.
+17. Bug fix - correct problems with drag drop of a directory.
 
-6. Bug fix - DeepSkyStackerCL was only displaying the help text regardless of command line input.
+18. Enhancement - if Custom Rectangle mode is read from a filelist or settings file, switch to Intersection mode.
 
-7. Enhancement - Reinstate Image Properties as a Qt based dialogue to allow changing e.g. exposure for multiple images at once
+19. Bug fix - correct handling of reference frame in filelist.
 
-8. Bug fix - Fields in the image list and the group tabs were not updated when switching to another language.
+20. Bug Fix - FITS/DDP choice of Camera was not being handled correctly.
 
-9. Bug fix - remove all "Set Black Point to Zero" recommendations from "Recommended Settings"
+21. Bug fix - ensure that reference frame is used a) when checked, and b) when not checked
 
-10. Bug fix - Invalid input in RAW/DDP settings for scale factors caused an assertion failure
+22. Bug fix - Register settings set a value of 0 for the luminance threshold when it was initially set to 20.
 
 Welcome to DeepSkyStacker 5.1.0
 ===============================