Graphic3d_ZLayerSettings - public fields have been replaced by methods.
Added new property Origin defining local coordinate system for all Layer objects.
Syntax of Draw Harness command VZLayer has been redesigned.
Graphic3d_CStructure now stores bounding box with double precision floats.
OpenGl_BVHTreeSelector - frustum culling now works with double precision floats.
OpenGl_GraphicDriver::ZLayers() / V3d_Viewer::GetAllZLayers() now return
the layers sequence following rendering order (taking into account IsImmediate flag).
StdSelect_ViewerSelector3d::Pick() now sort result taking into account ZLayers flags.