Made some funcs in the star module private

I don't think these need to be exposed to the user (e.g. me). I'm now
going to make some more changes that should speed stuff up a bit.
Speed update, stats updates

I removed a deepcopy to improve speed. I'm also reorganizing how I keep
track of stats to be more reasonable given that some of the functions
are private.
Changed out how I report stats

Rather than printing to a file I'll just return a list of strings that
are human readable and can be printed to the screen or a file by the
user.
Merge branch 'privates'

Conflicts:
	cdpybio/star.py
	tests/star/test_star.py