* Added the basics of GxsCircles service to libretroshare.

- Defined the control group stuff.
  	- Background task to determine friend membership.
	- Caching of Circle info,
	- Added GXS interface class to gxs/rsgixs.h
 	- TODO: Serialiser is incomplete.
	- TODO: SubCircles to be done in Phase 2.

 * Improvements to RsMemCache:
	- Added Value& ref(Key) to avoid data copying.
	- Added Statistics to check cache performance.
	- Fixed up bugs in tracking membership.

 * Improvements to RsTickEvent:
	- Added additional string parameter for more specificity.




git-svn-id: http://svn.code.sf.net/p/retroshare/code/branches/v0.5-gxs-b1@5910 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/gxs/gxstokenqueue.h

@@ -58,6 +58,8 @@ bool	queueRequest(uint32_t token, uint32_t req_type);
 
 void	checkRequests(); // must be called by
 
+	protected:
+
 	// This must be overloaded to complete the functionality.
 virtual void handleResponse(uint32_t token, uint32_t req_type);