Doks

* Handle __init__.py files better

* First release
* Better handling of ticks
* Better handling of links
* Handle xmod extensions better
* Remove trailing paren in message
* Handle backticks more gracefully

* Add . to PYTHONPATH in from_command
* Add doks settings to pyproject.toml
* Improve output slightly
* Add describe_doks for custom help messages
* Move rst to its own subdirectory
* Read _DOKS from the main module
* Better description of partials
* Indent function signatures that are too long
* Use shortened name for xmod modules
* Print to sys.stderr consistently
* Read doks arguments from pyproject.toml
* Handle partial functions better
* New --force argument
* Handle default targets better
* Add a Comments header for epilogs
* Fix results for simp
* Commit test for wrong results for simp
* Rename some test files
* from_command now expects strings only
* from_files.py no longer knows about variables

* Enable Python 3.9

* Add shields.yml to MANIFEST.in

* Improve robustness, check error cases
* Add MANIFEST.in
* Use tdir() parameter chdir
* Skip functions without doc strings in rst.py
* Use simplified tdir calls