added basic functions to collect bandwidth info in pqistreamer both ways; added a sorting method in BWGraphSource to create curves from extracted BW info. Still not yet functional

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@8600 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/gui/common/RSGraphWidget.cpp

@@ -203,6 +203,7 @@ void RSGraphSource::update()
         else
             ++it ;
 }
+
 void RSGraphSource::reset()
 {
     _points.clear() ;