TODO file for oSIP.

  *  Make the Documentation more up to date...
  *  Modify the way to register callbacks.
	*  we should avoid a library with unresolved symbol.
        *  some callbacks are not required.
  *  Transport layer that can reconnect to another port at run time.
	*  add a list_t of descriptor for UDP and another for TCP
		in the osip_t structure.
	*  transport threads will use a select on many sockets.
	*  a special descriptor will be added when user wants to
		update the list of descriptors.
  *  Provide other designs for the application.
	*  Less multithreaded.
	*  With no thread at all.
  *  Improve configure.
        *  make install does not actually install the include files.
        *  -lrt is needed on HP-UNIX.
  *  Support for multiple header on the same line
	* Done.
	* Some nasty behavior can still exist for unknown header
	that accept ',' in their definition.
  *  Better handling of quotes (get and set methods must be
	able to handle it)
  *  Add a parser for more headers.
  *  Add a real parser for SDP
  *  When content-length is missing but content-type is present, the parser does not parse the body.