2014.12.08:
- Fixed a bug in parsing 'absolute' RTSP "Range:" headers with no end time.
  (Thanks to Ken Chow for reporting this.)
- Added a new option "-K" to "openRTSP, to tell the client to periodically send "OPTIONS"
  requests as 'keep-alives' for buggy servers that don't use incoming RTCP "RR" packets to
  indicate client liveness.  (Thanks to Peter Schlaile for this suggestion.)
- Added a new 'protected' virtual member function "noteRecordedFrame()" to "QuickTimeFileSink".
  This function is called whenever a frame is recorded to the output file.
  The default implementation of this virtual function does nothing, but subclasses can redefine
  it if they wish.