#2753 Add ST_IsPlanar (hmm did I forget to put in this ST_MinkowskiSum)

git-svn-id: http://svn.osgeo.org/postgis/trunk@12643 b70326c6-7e19-0410-871a-916f4a2858ee
#2779 put in missing availability information

git-svn-id: http://svn.osgeo.org/postgis/trunk@12644 b70326c6-7e19-0410-871a-916f4a2858ee
Use macro GREP instead of hardcoded


git-svn-id: http://svn.osgeo.org/postgis/trunk@12645 b70326c6-7e19-0410-871a-916f4a2858ee