This includes changing a lot of routes and parameter names to be more
consistent. We try to remain backwards compatible as much as possible
by providing redirects from old routes and parameter names.

Port the entire batch job infrastructure, including scheduler, to use
the SQLAlchemy ORM instead of the old Db module.

Remove the dependency on configobj and have default values for all
configuration settings. User settings are defined in a Python module
pointed to by the MUTALYZER_SETTINGS environment variable.

We also clean up many configuration settings and remove some that
are no longer used.

Do not try to implement a full UNIX daemon suitable for init.d with the
batch daemon, but rather keep it simple and depend on something like
supervisord to implement process control.

We now also correctly handle SIGINT (Ctrl+C) and SIGTERM signals.

See http://stackoverflow.com/a/12297929