Fix pip-install problem

[steveri]

This merge updates our wheel distribution genesis-*.tar.gz to prevent transient errors arising from the previous version, as explained in issue #40. The new version is 0.0.11.

(Wheels let users install genesis2 using pypi distribution infrastructure e.g. "pip install genesis2".)

The error happened if/when someone did "pip install genesis2" in a clean environment (e.g. a fresh venv virtual environment), without first installing pre-required packages e.g. "pip install wheel".

This fixes that by adding a pyproject.toml requirements file. Also included is a new CI test to verify correct functionality. I added the test to the existing gold.yml suite, because I dunno why not.

Specific changes include:

Added some new files
 * `pyproject.toml` - tells installation sites what files are necessary to unpack the wheel
 * `docker-test.sh` and `Dockerfile.genesis` - added for testing
 * `genesis2-0.0.11.tar.gz` - new distribution wheel for pypi, in sdist format

Deleted an old file
 * `make-pip.sh`: this was completely redundant vs. the new README-pip.md

Updated a README file