#2582 fix all references to -1 in constructors and change to 0 (SRID Unknown)

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12230 b70326c6-7e19-0410-871a-916f4a2858ee
#2576 Error in manual wrt using_raster RT_PLPython

git-svn-id: http://svn.osgeo.org/postgis/branches/2.1@12232 b70326c6-7e19-0410-871a-916f4a2858ee