Amend r6323: Make work correctly for scaling other than Y=1
Amend prev commit: wxPython 3 compat
Log dialogs & choices
Warn when display or graphics driver levels seem to be misconfigured
Do not try to parse wxPython version as int
Fall back to 'close' command
Cosmetic: Remove redundant code
Amend r6323: Include WP
Unlock 3D LUT res for DCL
Also adjust A2B for black point if using measured black