Added foreground and background colors unique for each View (model) to Preferences and to Preferences Dialog.
Implemented unique background colors for each model type (Surface/Montage, All, Chart, and Volume).
Added preferences color for chart matrix grid lines.
Adjusted positions of chart axes name labels so that they do no overlap the numeric text
Improve default chart model selection to a model that contains data instead of the first chart type that might be available but not contain data.
Fixed orthogonal slice drawing so that if a voxel is not drawn in a volume slice (perhaps due to thresholding), the background color will be visible.
hide OpenGL Drawing method on Preferences->OpenGL tab.