added button to show/add all possible ids into external group, not only signed ones

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7356 b45a01b8-16f6-495d-af2f-9b41ad6348cc
fixed stupid serialisation error causing routing matrix not to be loaded properly

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7357 b45a01b8-16f6-495d-af2f-9b41ad6348cc