allow postgres/postgis to be used: remove assumption that the db is sqlite and add the USE_SPATIAL hooks back in
allow postgres/postgis to be used: remove assumption that the db is sqlite and add the USE_SPATIAL hooks back in

ocefpaf/ulmo,nathanhilbert/ulmo,ocefpaf/ulmo,cameronbracken/ulmo,cameronbracken/ulmo,nathanhilbert/ulmo