[josm_plugins] fix EDT violations in measurement and reltoolbox plugins

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29344 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_reverter] fix EDT violations + various UI improvements in query dialog

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29347 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_reverter] fix two regressions introduced in last commit

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29348 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4