fixed bug in test_cluster.py resulting in failed test...multivariate_normal() size arg should be a tuple
also cleaned up some PEP8 formatting issues
fixed PEP8 formatting in test_FCM_collection.py
convert FCMCollection from DictMixin -> MutableMapping (DictMixin is deprecated)
forgot a leftover FCMcollection import (now FCMCollection)
fix bug in fcmdata.py where channels property was only returning the 2nd letter for all the channel names...fixes failed test 'test_check_names' in FCMCollectionTestCase
the previous bug fix was related to a recent addition of short names and long names, removed that, may re-implement later using PnS and PnN FCS fields directly
add back in all the unit tests
PEP8 formatting in test_FCM_data.py
PEP8 formatting for more tests
remove unused imports