Stopped clobbering conf.py within the jail, using a proper ivle.conf instead. Now works with Python 2.6 (and can have another version, possible 2.6, inside the jail).
ivle/config/ivle-spec.conf: Added user_info section with in-jail variables. ivle/makeuser: Writes a conf file (ivle.conf) instead of conf.py. ivle/conf/conf.py: Added emulation layer bindings for the in-jail variables. ivle-buildjail: No longer REMOVES the conf.py file (since it's just a normal source file now).