#2753: patch from vmp -- revised patch moving intro into an abstract instead of as separate section

git-svn-id: http://svn.osgeo.org/postgis/trunk@12626 b70326c6-7e19-0410-871a-916f4a2858ee
#2753 change func proto ST_Minkowski to ST_MinkowskiSum

git-svn-id: http://svn.osgeo.org/postgis/trunk@12627 b70326c6-7e19-0410-871a-916f4a2858ee
#2753 fix xsl to not trap intro

git-svn-id: http://svn.osgeo.org/postgis/trunk@12628 b70326c6-7e19-0410-871a-916f4a2858ee