Updated the notification system. Main changes are:

- the notification system is now a service, p3Notify, that is a public RsNotify.
- RsNotify does nothing except providing a registration system for new notify clients.
- Clients should derive a notify client from the NotifyClient class and register it to rsNotify
- all registered clients get all notifications, so only derive the needed methods. This should allow 
  plugins to get notifications as well.
- updated the code to call RsServer::notify()->[notification method] from inside libretroshare
- pqiNotify has been removed.



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6996 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/pqi/p3netmgr.cc

@@ -42,7 +42,6 @@
 const int p3netmgrzone = 7563;
 
 #include "serialiser/rsconfigitems.h"
-#include "pqi/pqinotify.h"
 #include "retroshare/rsiface.h"
 #include "retroshare/rsconfig.h"