Introduce Point Sprites usage.
Graphic3d_Group - drop Marker(),MarkerSet() methods - markers should be drawn using AddPrimitiveArray.
Added new Draw Harness commands vcaps, vmarkerstest.
WNT_Window::Dump method calls were replaced with V3dView::Dump calls
Type casts were removed
Added supported image formats in file filters of Export methods, edited documentation for Image_AlienPixMap class
Supported image formats filter for 2dsample was extended