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