Revision 2471

Make the test suite work with PostGIS 0.8.2 and PostgreSQL 7.4

* test/postgissupport.py (find_postgis_sql): Different postgis
versions put the postgis.sql file into slightly different places
so we have to look in both.  The updated doc string describes this
is more detail.

* test/test_postgis_db.py
(TestPostGISSpecialCases.test_column_name_quoting): The return
value of UniqueValues is unsorted, so it has to be sorted for
comparison.