[mp3togo] GTK interface source code added to repository

[sim]

I've added some new code to the repository. 

The gui mode can be invoked with mp3togo -X. It runs and converts files,
but it is still incomplete and fairly ugly. 

I posted the script I use to invoke mp3togo from the code in a source
tree. It's just a hack and will need to be modified with the path to
your source tree.

The script is called test-mp3togo and can be found here:
http://puddle.ca/mp3togo/tools

The interface has been designed using glade 2. The xml interface
description lives in lib/mp3togo.glade it needs more work. The package
installs it to <sys.prefix>/lib/mp3togo/mp3togo.glade this would be
/usr/lib/mp3togo/mp3togo.glade on a Debian system. 

I'm pretty sure this is right, but I've not been able to find any
examples of how other programs handle this. 

I haven't tried to install it yet.

If mp3togo is started with a different name (eg. test-mp3togo) it
assumes it is running from within a source tree and looks for the glade
file in ../lib/mp3togo.glade relative to the path of the mp3togo.conf
module. This is to make it easy to test a source tree, but may be
removed from distributed code.  

I'd appreciate any feedback on the new GUI. Happy hacking,

-- 
sim