Changes from 7/11/2014.
Changelog:
2014.11.07:
- Added a new "RTSPClient" member function "disallowBasicAuthentication()" that you can call if
  you don't want a RTSP client to perform 'basic' authentication (whcih involves sending
  the username and password over the network), even if the server asks for this.
  (Thanks to Tomasz Pala for this suggestion.)
- Updated the debugging printout code in "RTCP.cpp" to identify all known RTCP payload types,
  even if we don't currently handle them.  We also - when doing debugging printout - parse and
  print out the contents of SDES RTCP packets.