Osmolytes

Additions

* Output surface area per residue type

Fixes

* Remove excess output on stdout/stderr

Additions

* CSV and Excel output

Changes

* Refactored tests to also test main driver (where relevant)

Changes

* Restricted Python version to 3.8+.

Fixes

* Removed [versioneer](https://github.com/python-versioneer/python-versioneer) support for versioning due to lack of compatibility with PEP517.
Replaced with `importlib` suggestion from [PyPA](https://packaging.python.org/guides/single-sourcing-package-version/).

Additions

* Add [versioneer](https://github.com/python-versioneer/python-versioneer) support for versioning

Fixes

Fixed problem with insertion codes and added tests for problems in the future.

Initial release.