improved layout of FriendsDialog, changed some naming to make it appear as a network visualization tab

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7517 b45a01b8-16f6-495d-af2f-9b41ad6348cc
improved layout of Identities tab, added help string

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7518 b45a01b8-16f6-495d-af2f-9b41ad6348cc
fixed up layout in chat lobbies - made it consistent with the other tabs

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7519 b45a01b8-16f6-495d-af2f-9b41ad6348cc