Improvements to Comment Handling and GxsChannels.

- Added Vote dummy data into channels.
 - Fixed up RsGxsImage handling to avoid memory issues - need to switch to shared_ptr later.
 - Added "BestScore" calculations into Comments - not sure if the maths is right.
 - Added Hashing interface to Channels.
 - misc bugfixes.



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6218 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/retroshare/rsgxschannels.h

@@ -104,6 +104,11 @@ virtual void setChannelAutoDownload(uint32_t& token, const RsGxsGroupId& groupId
 virtual bool createGroup(uint32_t &token, RsGxsChannelGroup &group) = 0;
 virtual bool createPost(uint32_t &token, RsGxsChannelPost &post) = 0;
 
+        // File Interface
+virtual bool ExtraFileHash(const std::string &path, std::string filename) = 0;
+virtual bool ExtraFileRemove(const std::string &hash) = 0;
+
+
 };