lsst_versions

This package is used to calculate a version dynamically from a Git repository when it is being built by pip. It is not needed for EUPS-only packages, and the calculated package version will be pip-compatible and thus differ from that produced by EUPS's pkgautoversion. It avoids the need to hard-code and continually update a version string. It assumes the use of LSST DM release and tagging practices.