Change ST_force_sfs to ST_ForceSFS, also in ST_ConcaveHull calls...

git-svn-id: http://svn.osgeo.org/postgis/trunk@11404 b70326c6-7e19-0410-871a-916f4a2858ee
Update NEWS related to #2254 and #1823

git-svn-id: http://svn.osgeo.org/postgis/trunk@11405 b70326c6-7e19-0410-871a-916f4a2858ee