modified:   corpus.py
- skip symbol support on read_corpus
modified:   quantizer.py
- from now on, e2c is default
new file:   exp/exp.py
modified:   exp/exp01.py
- more common stuff in exp.py
- only parameter settings are in exp01
modified:   create_3state_wfsa.py
- harant and emission support in creation
- arguments commented/explained