Now creates the XML for dvd menues, and multiplex them with the MPEG file

Now allows to send a file to stdin in a process, and store stdout in another file

src/devede/avconv_converter.py

@@ -17,7 +17,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>
 
-from gi.repository import GLib
 import subprocess
 import os
 import devede.configuration_data