Fix some problems

Fix problems in the histogram calculation
Change handle of frame count in the stream handlers

lib/StreamHandlerPortableMap.h

@@ -40,7 +40,6 @@ public:
   Bool openHandler( String strFilename, Bool bInput );
   Void closeHandler();
   Bool configureBuffer( PlaYUVerFrame* pcFrame );
-  UInt64 calculateFrameNumber();
   Bool seek( UInt64 iFrameNum );
   Bool read( PlaYUVerFrame* pcFrame );
   Bool write( PlaYUVerFrame* pcFrame );