Revision 1664

As preparation for the 0.9 release, switch thuban files to a
non-dev namespace

* Thuban/Model/save.py (SessionSaver.write_session): Write files
with the http://thuban.intevation.org/dtds/thuban-0.9.dtd
namespace

* Thuban/Model/load.py (SessionLoader.__init__): Accept the
http://thuban.intevation.org/dtds/thuban-0.9.dtd namespace too

* test/test_save.py (SaveSessionTest.dtd)
(SaveSessionTest.testEmptySession)
(SaveSessionTest.testSingleLayer)
(SaveSessionTest.testLayerProjection)
(SaveSessionTest.testRasterLayer)
(SaveSessionTest.testClassifiedLayer)
(SaveSessionTest.test_dbf_table)
(SaveSessionTest.test_joined_table)
(SaveSessionTest.test_save_postgis): Update for new namespace

* test/test_load.py (LoadSessionTest.dtd, TestSingleLayer)
(TestLayerVisibility.file_contents, TestLabels.file_contents)
(TestLayerProjection.file_contents)
(TestRasterLayer.file_contents, TestJoinedTable.file_contents)
(TestPostGISLayer.file_contents)
(TestPostGISLayerPassword.file_contents)
(TestLoadError.file_contents, TestLoadError.test): Update for new
namespace