Added TKOpenGlTest and TKD3DHostTest Draw Harness plugins.
TKOpenGlTest is automatically loaded by ViewerTest::ViewerInit().
Commands vgldebug, vvbo, vcaps and vuserdraw have been moved to TKOpenGlTest.
New command vglshaders lists GLSL programs defined by OpenGl_GraphicDriver,
previously implemented by "vshaderprog -list".
Added new command vdriver for graphic driver selection.
Removed erroneous code from command vstereo.
Test bugs vis bug26357 is revised to check colors in more robust way.
In tests bugs vis bug29091_*, size of produced file is checked to be within range of known valid sizes, rather than hard-coded (per-platform) exact sizes.
FPE signals are disabled for test bugs vis bug29127 to prevent exceptions cause by software OpenGl driver.
File data/occ/Box.brep is removed to avoid confusion with file box.brep in public data files used in tests.
Two additional non-alphabetic-order combinations of complex types are handled in RWStepAP214_ReadWriteModule.cxx
