Tox

add tx direct test variant #38

Job	Run time
Lint python sources with ruff	12s
Build html documentation with mkdocs	2m 51s
Run unit tests, ubuntu-latest, 3.10	6m 16s
Lint markdown files with markdownlint	4s
Run unit tests, macos-latest, 3.11	6m 20s
Spellcheck sources with pyspelling	30s
Run unit tests, ubuntu-latest, 3.12	6m 14s
Fill tests, deployed, ubuntu-latest, 3.11	6m 2s
Typecheck python sources with mypy	27s
Fill tests, deployed, macos-latest, 3.12	4m 19s
	33m 15s

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