fix #9093 - teach validator about "subarea" and "land_area" roles of administrative boundary relations

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6305 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #9145 - delimiter for combo

Delimiter is already supported, adding documentation in head of defaultpresets



git-svn-id: http://josm.openstreetmap.de/svn/trunk@6306 0c6e7542-c601-0410-84e7-c038aed88b3b