Hangup if NO number have been dialed, except if call->CALL_STATE_TRANSFERT

You have to add your IAX2 account in /etc/asterisk/extensions.conf
No more segmentation fault when an incoming call is answered.

Replace iax_quelch by iax_quelch_moh ( with boolean = true )

Bug: With an IAX account, when you put someone on hold and then took him off hold, there was no outgoing audio from sflphone
Fix: We have to call audiolayer->startstream() to make the capture starts

Looking for translators ..

Almost no glitch on playback ( asterisk vocal messages )

Use of GTK_FRAME

The user can choose in the account window if he wants to enable STUN

Use of gettext (libintl.h)
For now it should work if you install the sflphone.mo file ( binary which contains the translations )
in your /usr/share/locale/fr/LC_MESSAGES

TODO: put only the .po file in the git repository and compile it at the build time

The daemon crashed when a file with a filename too short was in the directory.
Add length check and extension check before doing anything