put full version number on st_tpi, st_tri, st_roughness

git-svn-id: http://svn.osgeo.org/postgis/trunk@11382 b70326c6-7e19-0410-871a-916f4a2858ee
#2242: Clarify behavior of ST_Union with NULLS

git-svn-id: http://svn.osgeo.org/postgis/trunk@11383 b70326c6-7e19-0410-871a-916f4a2858ee