Final step for Release 1.2.

Next preparation step for release 1.2 which includes minor bugfixes and improvements.

Several changes: - Backends need no longer be listed in backends/__init__.py - New spoolerctl command "rmbackend" to remove backends that crashed or otherwise disappeared - Introduced root user; some commands now require root privileges

Fixed pythondoc comments; set copyright year to 2007.

add the JvaRE backend

Initial version of the Keywords backend. This backend checks submissions for the occurrence of keywords (or regular expressions) and returns the percentage of matches found. This is mostly intended as a self-contained example of a backend, but it may actually be useful.

Added import for backend Scheme.

Prolog backend, initial check-in.

Added backend Python.

Initial check-in.