* implement retry of EWOULDBLOCK returned send()
* rework channel's listener for clarity
* fix various memory leaks.

Added a belle_sip_dict_t that has base accessors over this storage, and the appropriate unit tests.

Also, A resolution following SRV results now takes place in parallel.

implement maddr in hop resolution
make belle_sip_hop_t a real object.

moment.

fix param less address spec (I.E header like From: sip:toto@titi.com:tag=asdad )

fix refresher

belle_sip_provider_add_authorization

remove qop from default authorization