Wikivector

This version switches to a modern build system and adds a utility for stripping remaining tags that may be left by WikiExtractor for older Wikipedia dumps.

* The build system is defined by the `pyproject.toml` file.
* Setup options are now mostly set by `setup.cfg`.
* The `wiki_remove_tags` script can be used to strip out some common remaining tags from extracted Wikipedia text.

This version fixes a bug and adds a script to help identify missing articles.

* Fixes a problem that can occur if creating a header file using an absolute path or from outside the text directory. Header files now save paths relative to the extracted Wikipedia text directory to avoid this problem.
* Adds a script, `wiki_check_map`, to make it easier to check for missing articles in a header file.

This version fixes an issue when loading vectors from a file using h5py 3. Installation now requires h5py>=3.

This version adds support for Zenodo archiving.

Fixes an issue with embed_articles where vectors were not saved correctly.