Some warnings were removed from MFC samples
All warnings of sample projects with warning level 4 were fixed on VC9
Warnings level increased to -W4 in projects of MFC samples; sample ReadMe files added to documentation
Changes in Viewer2dDoc.cpp and OcafDoc.cpp were restored.
Minor corrections in documentation
Introduce Point Sprites usage.
Graphic3d_Group - drop Marker(),MarkerSet() methods - markers should be drawn using AddPrimitiveArray.
Added new Draw Harness commands vcaps, vmarkerstest.
