set background texture method
by default enabled tests vtk
improved background gradient
added painted cloud widget
added support of texture for mesh
updated mesh reading (texture support)
updated for compatibility with VTK6.0
added test for textured mesh
minor iteractor refactoring
resolved problem with multiple spin()/spinOnce()
merged background color with background gradient methods, updated tests to show description of scene
fixed warnigns and compiler errors for Ubuntu
implemented workaround of a problem with x-server for ubuntu
disabled Ubuntu workaround code for Windows
fixed documentation warnings
fixed white spaces
closing window
Merge pull request #2174 from Nerei:yet_another_fix_for_pr2172
Merge pull request #2160 from SpecLad:norm-assert
added cv::[extract|insert]Channel to T-API