PEP8 modifications
Return all select fields in queries and select actual field name
Make getters / setters more flexible for multiple field elements

Now I can get and set individual fields like ensemble members.
Raise AttributeError if nonexistent field attribute is queried
Remove AttributeError for correct output name formating
Half-baked name generation with ensemble members
Add logic for handling forecast times
Teach generate_output_name() to deal with forecast times
Remove old TODOs
Merge branch 'output_filenames'