added chunk splitting in case part of the file transfer data does not come. Added strategy to ask again for missing data. The combination of these two cannot result into an infinite loop (as before)

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4610 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/ft/ftchunkmap.h

@@ -34,7 +34,7 @@ class ftChunk
 	public:
 		typedef uint64_t ChunkId ;
 
-		ftChunk():offset(0), size(0), ts(0) {}
+		ftChunk():offset(0), size(0), ts(0),ref_cnt(NULL) {}
 
 		friend std::ostream& operator<<(std::ostream& o,const ftChunk& f) ;
 
@@ -42,6 +42,7 @@ class ftChunk
 		uint64_t size;		// size remaining to download
 		ChunkId  id ;		// id of the chunk. Equal to the starting offset of the chunk
 		time_t   ts;		// time of last data received
+		int	  *ref_cnt; // shared counter of number of sub-blocks. Used when a slice gets split.
 		std::string peer_id ;
 };