new file:   mdl.py
deleted:    round_automaton.py
- round_automaton is completely useless, last useful feature has been
  (partially) reimplemented by mdl.py
modified:   learner.py
- output is now a parameter (defaults to stdout)
- now calls mdl() at the end of the learning (with some non-set
  variables, so not correct numbers yet)
deleted:    main.py
all the functionality is taken care of by other codes
modified:   automaton.py
modified:   corpus.py
- some TODO comments removed
modified:   automaton.py
modified:   learner.py
- some bugfixes, now an end-to-end test worked (automaton creation and
  dump, code creation and dump, learning)