remote control load_and_zoom+addtags improvemens, allow to delete tags (by setting empty value)
trim spaces from key/value, allow "=" in value

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5706 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror