deleted:    tsetseDB/tsetseDB.py
new file:   tsetseDB/utils/constants.py
new file:   tsetseDB/utils/errors.py
new file:   tsetseDB/utils/parsing/__init__.py
new file:   tsetseDB/utils/parsing/column_data.py
removed from tsetseDB import tsetseDB
tsetseDB/utils/database_description.py:

- Fixed types.Enum calls
- Corrected get_engine()'s use of metadata.create_all() (tied to Base
now)