Improved renderview GUI: left, right, bottom.
Added graphic link/unlink channels button to clipping.
Moved link rotations to settings, fixed delayed rendering when active.
moved scalebar options from vPropView to vRenderView options.
moved interpolate to vPropView (now editable per channel/group)
fixed painting bug in shader.
separated different groups of buttons on renderView top options.
size adjustments
finished slicing angle adjustment
improved slicing, steeper mapping curve
improved tracking of unpreprocessed data
Merge branch 'master' into yong_experimental

Conflicts:
	fluorender/FluoRender/FLIVR/ImgShader.cpp