modified:   automaton.py
- bugfix: if more than 10 states per letter had been given in the dump, dump reader
  would have crashed
modified:   automaton.py
small changes:
- accept 0.0 as log space value
- check_node_sum() now is less strict (1e-3 bound)
modified:   learner.py
modified:   mdl.py
- implemented moore_mdl() in a way that assumes 135 words (HACK)