Add very basic postgis database support and the corresponding test
cases. The test cases require a PostgreSQL + postgis installation
but no existing database. The database will be created
automatically by the test cases
* test/README: Add note about skipped tests and the requirements
of the postgis tests.
* Thuban/Model/postgisdb.py: New. Basic postgis database support.
* test/test_postgis_db.py: New. Test cases for the postgis
support.
* Thuban/Model/wellknowntext.py: New. Parser for well-known-text
format
* test/test_wellknowntext.py: New. Test cases for the
wellknowntext parser
* test/postgissupport.py: New. Support module for tests involving
a postgis database.
* test/support.py (execute_as_testsuite): Shut down the postmaster
if it's still running after the tests
* Thuban/Model/data.py (RAW_WKT): New constant for raw data in
well known text format
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trunk/thuban/Thuban/Model/data.py