Add one more pre-defined Z-layer Graphic3d_ZLayerId_BotOSD.
Define new Transformation Persistence flags Graphic3d_TMF_2d and Graphic3d_TMF_2d_IsTopDown
for displaying objects in screen coordinates.
Anchor point defines angle of the screen to display the object in similar way as for Graphic3d_TMF_TriedronPers.
Extend Draw Harness command vdisplay with new options:
-overlay as alias for -toposd.
-underlay and -botosd.
-noselect to prevent automatic selection activation.
-dispMode and -highMode to define displaying and highlighting modes.
-2d, -2dtopdown and -3d to manage displaying in screen coordinates.
-trsfPers and -trsfPersPos for Transformation Persistence options.
Drop command vsettransmode, replaced by vdisplay.
Correction of test-case bugs vis bug641
Modified TODO in some offset cases.
Deleted the same test cases bug697_* in /bugs/modalg
Deleted test cases which is based on v2d commands
Added test cases to folder bugs
Adding procedures checkcolor and checkpoint.
Modified test cases which are used QAGetPixelColor or QAAISGetPixelColor2d
Allow using command QAAISGetPixelColor2d on WNT
Rename test case tests/bugs/vis/bug19619 to pro19619
Added test cases to modalg and moddata
