remove image cropping in georef refinement.

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29722 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_lakewalker] code cleanup

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29723 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
JOSM "multipoly-convert" plugin no longer required since this function has been integrated into core in r3704, 3 years ago

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29724 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4