[Xenocide-programming] updated GeoData.h

[<chr...@ju...>]

I spent some time this morning trying to get GeoData.h working with the xeno utility librararies and in a compilable state.  I had to hack several  parts of the libraries to get it to compile in Linux, but it turned out OK.  Here is the result.  I'm still not sure how to best implement counted references.  I'll try and get that done this weekend.  The class should at least be more coherent now. :-)

-chrisp