Cosmetic reformat of UM/CF map.

This PR includes minor format changes to the ```um_cf_map.py``` file. There are **no** data changes.

These changes pave the way (eases the pain) for a following PR #842 which incorporates the new UM/CF translations generated by MetaRelate.

The summary of main format changes:
 * ```CFname``` to ```CFName```,
 * ```<space>:``` to ```:``` (removal of leading space in front of colon from dictionary key/value pairs),
 * ```"``` to ```'```,
 * ```cfname=``` kwarg assignment is removed, and
 * ```unit=``` kwarg assignment is removed.

This PR must be merged before #842.