#2168, ST_Distance is not always commutative


git-svn-id: http://svn.osgeo.org/postgis/trunk@11530 b70326c6-7e19-0410-871a-916f4a2858ee
#2315, geography_distance_uncached: variable ‘tolerance’ set but not used


git-svn-id: http://svn.osgeo.org/postgis/trunk@11531 b70326c6-7e19-0410-871a-916f4a2858ee