Version 1.4.1

make system:
- shortened dev build version
- removed py_sems from sems-python-modules packet.

docs:
- included monitoring mod documentation
- clarified use of multiple interface support

event dispatcher:
- fixed minor memory leak in error case.

session management:
- fixed several bugs in session creation.

sip:
- return 481 on CANCEL if the transaction cannot be found.
- reply properly with 482 if the UAS dialog already exists.
- pass only 200-ACK request to the UA layer.
- do not update route or remote_uri on failure reply.
- "ACK for non-existing dialog" logged as DEBUG
- do not mandate to-tag for anything else but 2xx replies.
- do not pass orphan replies to UA (no matching transaction).
- improved AmSipDialog::bye()
- next_hop core option added.

sdp parser:
- process properly on short SDP
- allow unsupported transport types.

B2BUA:
- fixed manipulation of short/empty SDP.
- treat CANCEL hop-by-hop (not waiting for 200 from other side).
- avoid relaying events if the session is stopped.
- bind the relay stream to the local RTP IP.

RTP relay:
- fixed sequence number & SSRC of relayed RTP packets.

sbc:
- handle correctly onNoAck event.

authentication:
- adds support for "qop" as described in rfc2617.
- resend authenticated request as VERBATIM (fixes dup. Max-Forward
& User-Agent HF)

xmlrpc2di:
- added clean shutdown procedure.
- fixed issue related to select() and file descriptors >= 1024

monitoring
- monitoring: run garbage collector by default (avoid filling up RAM
with monitoring data).

g729:
- fix mem leak in g729 wrapper.