Initial data with pre-standard formats.

This is the initial public release of Alignment data from Biblica/Clear, with data as of late 2023.
This will be superseded by Burrito format data in April 2024: we're tagging this release for posterity. Documentation and tests are incomplete, but all tests currently pass. We use poetry: see pyproject.toml for dependencies.

Expected changes for the next version:

• Revisions to the data organization and formats for sources, targets, and alignments.
• Better tools for reading alignment data.
• Improved documentation.