Revision 2472

Add support for PostGIS tables with LINESTRING geomentries.
Fixes RT#2299

* Thuban/Model/postgisdb.py (shapetype_map): Add LINESTRING

* test/postgissupport.py
(PostgreSQLServer.get_default_static_data_db): Rename the "roads"
table to "roads-multi" because it now uses MULTILINESTRING
geometries and introduce a new "roads" table that uses LINESTRING
(coords_to_multilinestring): Make the doc string more precise
(coords_to_linestring): New.  Create a LINESTRING WKT
representatin
(wkt_converter): Add coords_to_linestring
(upload_shapefile): Rephrase the doc-string a bit.

* test/test_postgis_db.py (TestPostGISShapestoreArc)
(LineStringTests)
(TestPostGISShapestoreLineString)
(TestPostGISShapestoreMultiLineString): Split
TestPostGISShapestoreArc into a base class LineStringTests and two
derived classes TestPostGISShapestoreLineString for LINESTRING
geometries and TestPostGISShapestoreMultiLineString for
MULTILINESTRING geometries.  Most test methods are in the base
class with the exception of tests that explicitly check the raw
format.