Test case bugs/vis/bug10781 - use smaller line width in test case
(some Intel OpenGL drivers support only 7 pixels-width lines).
Test case bugs/vis/bug23227 - just check triangles count in feedback buffer is not 0.
StdPrs_ToolShadedShape::IsClosed():
- return true if shape is closed Solid (NOT just free closed Shell)
- accept compound of closed Solids as well
- ignore Solids with incomplete triangulation
TKOpenGl, automatically disable back face culling when:
- clipping/capping planes are in effect
- for translucent objects
Update bug23227 test case (now back faces are clipped).
OpenGl_Workspace::AspectFace() - disable culling in case of hatched style
