[osg-submissions] vpbheightfieldmapping

[Jean-Christophe Lombardo]

Hi

I've added a -hf (or --HeightField) and -shp command line options to
respectively specify the height field and shape files to load. Default
behavior is kept (ie loading files from David's computer :) ).
I've also added a polygon offset to force the mapped shapefiles to be
over the terrain.

-- 
Jean-Christophe Lombardo
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