Update bmrb.py to use new c clean_value method and make a few minor changes to speed things up. Conditionally import _from_iterable too since it is a lot faster.
Update bmrb.py to use new c clean_value method and make a few minor changes to speed things up. Conditionally import _from_iterable too since it is a lot faster.

uwbmrb/PyNMRSTAR,uwbmrb/PyNMRSTAR,uwbmrb/PyNMRSTAR