- less code duplication
  - automaticly try HTTP tunneling if describe fails
  - upon authentication failure, ask for a new user/passwd and try again (untested due to lack of a rtsp source)
  - fix a bug with adding tracks introduced in [16114]
  - fix a bug closing the RTSPClient
  - disabled the QT VoD detection because it's unreliable like hell.

  TODO:
  - test with a WMS RTSP session
  - test against a paswd. protected RTSP session
  - find a better way for error communication with live (parsing random strings is so 1990)
  - find a way to relay Control() calls to a subdemux (for time/pos in TS)
  - add the HREF support of the 0.8.5-href branch
  - better flushing etc. during the PAUSE (ideas anyone?)