support for retroshare links in gxs forums

- only group can link at the moment

added more nxs tests and better cleanup
- test ability sync with a delayed circle load 

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7384 b45a01b8-16f6-495d-af2f-9b41ad6348cc
updated .pro build file for tests

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7385 b45a01b8-16f6-495d-af2f-9b41ad6348cc