Bumping version to v0.32.0

abiftool v0.31.0: SF 2024 elections, FPTP support, improved testing, …

…and bug fixes

Distributing fetchspecs with pypi package

Better --list-contents, --container, and input_file error messages

Stop relying on "tenn-example" symlink in some test files

The html_test.py and irv_test.py files pointed to the
testdata/tenn-example symlink.  Now they don't.

Bumping version to 0.2.0

Bumping version number in pyproject.toml and generalizing requirement…

…s.txt

Updated pyroject.toml after some rudimentary testing