GeometryView -- add context menu entry for applying color to children.
Store ligt/dark TGLColorSet as members in CmsShowCommon, do not rely on default Eve viewer being present.
Merge pull request #6033 from osschar/fworks-mt-1

Configuration load bugfix + GeometryView improvement
Merge remote branch 'origin/CMSSW_7_2_X' into CMSSW_7_0_X