Fix indent error on db setup script

On c01ce41 the PostGIS geometry and trigger creation code block was
moved inside the plpythonu functions one, so if you don't want to create
these functions, the PostGIS geometry column does not get created.
Fix srid typo in AddGeometryColumn

Was causing IntegrityErrors when loading a record
Merge pull request #177 from amercader/master

Fixes for PostGIS backend on the setup script