Log Message:
update to 2.2.0
changes:
* remove #ifdef OSIP_RETRANSMIT_2XX to always compile it.
* initialize remote_contact_uri when dialog is built with notify.
* allow very short attachements.
* new macros allocators.
* remove use of alloca in the parser.
* fix memory bug when realloc is needed on large message.
* remove useless prototypes.
* fix memory access in parser.
* API slightly broken to enable support for binary data.
* improvements of the sip message test suite.
The binary compatibility and API compatibility has been lost