[postgis] Minor changes

[Dave Blasby]

1. There is now a postgis uninstaller.  Just run the 'postgis_undef.sql'
script and it will delete all the aggregates, functions, operators, and
types created by postgis.   Running this script will screw up any table
with a geometry column or index in it, so use it with caution.  It is
auto-generated by the create_undef.pl script.

2. Rtree indexing is now removed from the postgis.sql install script. 
You shouldnt have been using them anyways (use the GiST index).

3. Since you must have plpgsql to use the AddGeometryColumn() or
DropGeometryColumn() functions, the postgis.sql file will give you
install instructions if its not installed.

dave

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