Merged branch v0.5-gxs-b1 into trunk (from -r 5351 -> 5995)

This brings a huge amount of goodness into the trunk,
but there is still a big chunk todo before it can be released.

 * GXS Backend.
 * GXS Services:
	- Identities.
	- Circles
	- Photos
	- Wiki
	- GxsForums
	- Posted.
 * SSH no-gui server.

See branch commits for more info.

To switch on GXS stuff, enable CONFIG += gxs
in both libretroshare.pro and retroshare-gui.pro



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5996 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/retroshare/rsplugin.h

@@ -105,6 +105,9 @@ class RsPlugin
 		virtual RsPQIService   *rs_pqi_service() 		const	{ return NULL ; }
 		virtual uint16_t        rs_service_id() 	   const	{ return 0    ; }
 
+		// Shutdown
+		virtual void stop() {}
+
 		// Filename used for saving the specific plugin configuration. Both RsCacheService and RsPQIService
 		// derive from p3Config, which means that the service provided by the plugin can load/save its own
 		// config by deriving loadList() and saveList() from p3Config.