[josm_poly] Update to JOSM 6031

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29711 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
fix raster image georeferencing issues. Add new MenuActionRefineGeoRef for a new georeferencing already referenced plan image.

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29714 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
update plugin version

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29715 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4