[postgis-users] new GEOS goodies in PostGIS CVS

[David Blasby]

I wrote a GEOS geometry -> PostGIS geometry converter.  I also added 
these GEOS functions:

intersection(geometry,geometry)
buffer(geometry,float8)
convexhull(geometry)
difference(geometry,geometry)
boundary(geometry)
symdifference(geometry,geometry)
GeomUnion(geometry,geometry)


"Union" is an SQL reserved word, so I used "GeomUnion" - anyone have a 
better name?

NOTE:
* convexHull() isnt working (should work when Yuri commits)
* buffer() -- has known issues (Yuri is looking at it)
* empty geometries are converted to SQL NULL's.
* GEOS is still leaking like a sieve - I'll make it stop when
   Yuri commits his memory management update


OGC SF SQL conformance TO DO:
* add WKB to PostGIS geometry converter
* minor itty bitty functions to add

dave