gis: geos: Re-factored GEOS interface. Improvements include:

 (1) All interactions with the GEOS library take place through 
     pre-defined ctypes prototypes, abstracting away return-value
     error-checking.
 (2) Mutability is now safe. Because GEOS geometry pointers are
     marked as `const` (Thanks Hobu), previous modification techniques 
     caused unpredictable instability when geometries were constructed 
     from the pointers of other geometries (e.g., a Polygon with rings 
     from another Polygon).  Geometry components are cloned first before 
     creation of the modified geometry.
 (3) Fixed memory leaks by freeing pointers from strings allocated
     in GEOS because ctypes only frees pointers allocated in Python.

Backwards-Incompatibility Notice:
 All children geometries (e.g., rings from a Polygon, geometries from a 
 collection) are now clones -- modifications will not propagate up to
 the parent geometry as before.


git-svn-id: http://code.djangoproject.com/svn/django/branches/gis@6653 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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