- added key removal method in OpenPGP-SDK
- improved FriendSelectionDialog/Widget to enable select all/none keys, and show non friend keys
- added safe key removal method in PGPHandler. Removed keys from other locations will not cause errors.
- added backup system to public keyring, impossibility to remove public parts of owned secret keys, etc.
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6382 b45a01b8-16f6-495d-af2f-9b41ad6348cc