SSA-6324: Tests are tightened up and more efficient; pylint is (somewhat) mollified; optimizing them flushed out a bug or two in the updater.

SSA-6324: datafetcher tests proceed as expected in IJ and at command line, but not in Docker container. scode_updater tests proceed as expected in IJ, but not at the command line or in Docker container. Requirements updated; convenience script added for rebuilds.

SSA-6324: schema init adds convenience methods suggested by Thomas; Project how has authors cascade; deploy requires Python 3.8; a project updater test now requires pytest-mock; updater and datafetcher tests complete, and most exercise CLI

SSA-6324: rearranged scode_project_updater package structure; started creating unit tests that don't depend on a particular state of the dev database

Implemented parsing of setup.py files within a buildout recipe; next is to generate meta.yaml files for each setup file parsed

SSA-6324: All tests pass when run locally. In Docker container, tests that exercise the CLI all fail, unable to find the "datafetcher" entry_point.

SSA-6324: tests pass when run locally; some fail in Docker container. Committing what I've got so as not to lose it after tearing my hair out for a day and a half.