Following comments on 5d21c69, we should simplify the code in setup.py that generates the version string that labels an installation of Slycot. This is somewhat nontrivial because, for non-release commits, it is useful to include the commit hash in the version string.

Two proposals have been made thus far:

1. use versioneer (5d21c69)
2. use make_version.py from python-control (5d21c69#commitcomment-20885735)

Interestingly, this is a perennial issue in the development of Python packages that have change history tracked in Git. Slycot requires compilation of FORTRAN code, so NumPy should be a good first reference regarding labeling built binary packages.