Removal of the /libs/dbus directory

Removal of libs/libiax2 from the git repo.
Use instead sflphone-iax2-dev from the sflphone repo.
Other debian package available: sflphone-iax2

To execute the program you only need sflphone-iax2; to compile it, you need the headers in sflphone-iax2-dev

Change the name of the libiax library

Thanks

Conforming to:
http://tools.ietf.org/id/draft-guy-iax-03.txt

See: http://tools.ietf.org/id/draft-guy-iax-03.txt

Removed also the now-unused libiax2.svn20060606.tar.gz that was included.

Remove also the libiax2.sh file. TODO: we need to automate the build of
libiax2 from that 'libs' directory.

Since there are multiple versions and that the official site isn't maintained,
we took the iaxclient version and merged it in here. We'll try to keep in sync
with those repos, and maybe we could host an updated version, or contact
upstream to ask them to merge the newer code.

https://iaxclient.svn.sourceforge.net/svnroot/iaxclient/trunk/
   `-> lib/libiax2

We'll try to merge often and keep up to date with them.

Modify Fedora Core spec to support fedora core 6 (libsamplerate, libeXosip2)

Makefile.am and m4 updates for warnings and paths, README updates.

Remove libexosip from CVS

Remove libexosip2
Add --disable-sflphoneqt to compile without X