Related to #1553. Add missing free in cu_surface cunit to be valgrind clean. As TGEOM was not used as storage serialization, i purely remove TGEOM for now, and kept only the TIN/POLYHEDRALSURFACE lwgeom expression (will see in future if we really need to have a 3D topological storage PostGIS side)

git-svn-id: http://svn.osgeo.org/postgis/trunk@11205 b70326c6-7e19-0410-871a-916f4a2858ee
revert wrong regress encoding stuff from r11205

git-svn-id: http://svn.osgeo.org/postgis/trunk@11206 b70326c6-7e19-0410-871a-916f4a2858ee