2.1.0 Update for Compatibility with MacTex-2022

This is a minor update to the .dtx file to provide compatibility with MacTex-2022.

It also includes changes that were not previously released, including:

• updates to the .dtx file for compatibility with the lineno package (fixes #48).
• fixed links to example files (fixes #46)

Despite this update, users are reminded that accessibility is not actively maintained and should be considered experimental. Functionality is not guaranteed.