#7 ".pov" gets added to .ter file name

[Ralf Lehmann]

When selecting a different directory for a Terragen
terrain file via "Browse" and "Save", pG adds ".pov" at
the end of the file name. I've also seen that the file
name for a "Landscape Mesh" gets an additional ".obj"
after "Browse" and "Save"...

[David Burnett]

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Fix checked in to CVS