New configuration system

SFLphone's configuration system have been completely rewritten. It now uses
YAML file format for a better readability and improved configuration handling.
This chage makes SFLphone easy to deploy on a large scale infrastructure as
several major scripting languages such as JavaScript, Perl, PHP, Python, Ruby
already have libraries supporting YAML.
 
A script to migrate prior configuration to new one is availabe here.
 
To process:
 
apt-get install python-yaml
python ini2yaml.py