CONTRIB: manage version number of Py client indep
CONTRIB: manage version number of Py client indep

This is motivated because:

1. the Python-based client will be distributed via the Python Package
   Index (https://pypi.org/), so version number changes that are only
   due to non-Python changes would be surprising or confusing.

2. the version of gr1c itself will be available via the client, which
   is consistent with the notion of being a wrapper.

3. the Python-based client will be able to use gr1c remotely via rcomp
   (https://github.com/slivingston/rcomp), and different servers might
   have different versions of gr1c installed.

[ci skip]

slivingston/gr1c,slivingston/gr1c,slivingston/gr1c