Replaced Python config files (conf.py) with new config files system, using
configobj (INI-file style config files).
setup.py config now produces ./etc/ivle.conf, a new-style config file.
ivle/conf/conf.py is now part of the IVLE source code. It reads the new config
file and provides the same legacy interface, so all of IVLE still functions,
including setup.py config.
Added /etc to the source tree (config files will be stored here).
Added configobj as a dependency in doc/setup/install_proc.txt.
setup.py install copies ./etc/ivle.conf into /etc/ivle/ivle.conf.
Removed boilerplate code generation from setup/configure.py (that code is now
part of ivle/conf/conf.py which is now in the source tree).