RFC: initial support of G.729 codec in makeann using open bcg729 library

Hello All!
This is a working support for G.729 in makeann utility using opensouce bcg729 library:

* http://www.linphone.org/technical-corner/bcg729/overview

It works pretty well (I'm using it with makeann as well as with SEMS). However I've heard that some people expressed concerns regarding bcg729's performance compared to the proprietary counterparts. Actually makeann isn't a very performance-critical application so I'm not sure if it's necessary to maintain an "old" G.729 API.

Any comments are highly welcome!