[JOSM-smed2] make plugin compatible again with Java6

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30171 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_housenumbertaggingtool] make the plugin compatible with Java 6 once again

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30172 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[JOSM-print] remove useless code that no longer compiles with JOSM 6578

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30173 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4