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.
For FSAA mode we now store the depth values from first sample in myRaytraceFBO1 and do not modify it while collecting the rest of samples.
When all samples are gathered we fetch color from myRaytraceFBO2 and depth from myRaytraceFBO1 and display it to the current FBO.
Test bugs vis bug27337 added.