Don't need to explicitly delete MapWidget, since it's owned by qtMapFrame
Add command-line parser to TestGDALRaster.cxx

Also incorporate "Bob's" color mapping function
Convert lat-lon to vtkMap coordinates outside of vtkRasterFeature class

Also remove some unused/redundant include statements
One more unused include statement
Merge branch 'john/object-lifecycle-fixes' into databrowser
Merge branch 'john/add-raster-feature' into databrowser