more GXS changes for phase1

clean up now on by default
- unsubscription from group also leads to message clean up
- check for keep flag

added functions to retrieve stats 
- not active yet

fixed forum authen flag 
- do not need author to create group
- also policy variable not initialised correctly

added KEEP and DELETE flag 

improved GXS resilience to peers sending NULL grp/msg binary data for deserialisation (peers could crash other peer by sending empty RsTlvBinaryData)

rstokenservice iface affected so full recompile recommended

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6274 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/retroshare/rsgxsiface.h

@@ -169,6 +169,21 @@ public:
      */
     virtual bool acknowledgeTokenGrp(const uint32_t& token, RsGxsGroupId& grpId) = 0;
 
+	/*!
+	 * Gets service statistic for a given services
+	 * @param token value to to retrieve requested stats
+	 * @param stats the status
+	 * @return true if token exists false otherwise
+	 */
+	virtual bool getServiceStatistic(const uint32_t& token, GxsServiceStatistic& stats) = 0;
+
+	/*!
+	 *
+	 * @param token to be redeemed
+	 * @param stats the stats associated to token request
+	 * @return true if token is false otherwise
+	 */
+	virtual bool getGroupStatistic(const uint32_t& token, GxsGroupStatistic& stats) = 0;
 };