add code that send a presence packet with an Nick extension
(to correctly display the the hammer user nickname in jitmeet).
Remove some overridden functions (because the hammer is like a client-side
application.
Change the CLOCK_ONLY to false so that the CaptureDevice
correctly send data.
Revert "Remove some overridden functions (because the hammer is like a client-side"

This reverts commit cb914c216b6e46190ffb6a4d8696d712a0084006.
add an description attribut to the run target so that the run target
is not considered as an Internal Target.
put setDevice call before the call to setFormat (because without it,
the stream wasn't correctly setup to use the given MediaFormat).

Also add a function that add parameter from PayloadType of a jingle IQ
to the corresponding MediaFormat (I'm not sure it's correct..).
comment some import that may be useful or not.