[GRASS-dev] multiple fixes for wxnviz in trunk

[Michael Barton]

I just committed a lot of bug fixes for wxnviz in trunk. If anyone has time, it would be good to know if these work on other platforms. If so, I can backport to 6.5. In overview, the changes include:

display now updates when options are changed
configuration now saves and loads correctly
interface is more compact and starts up in the view page
many misc. bug fixes

I did not test any of these changes for volumes because AFAICT,  there is no way to load a volume into wxnviz at this time.

Michael
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