get rid of hard-codings of schemas in sh profile, add logic to create data schema if not present

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@11750 b70326c6-7e19-0410-871a-916f4a2858ee
dupe 2934 (give Northwest next id)

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@11751 b70326c6-7e19-0410-871a-916f4a2858ee