linenoamsmath -- Make the `amsmath' package work with the `lineno' package

Karl Wette, 2021/09/29

This package patches the `amsmath' package to work with the `lineno'
package. The code I've used is largely based on the posts at
https://tex.stackexchange.com/a/461192 and
https://tex.stackexchange.com/a/443201; credit is due to their author.
In addition I've made a few refinements to handle some corner cases.

This work is licensed under the LaTeX Project Public License 1.3 or
any later version.

History:
* v1.0 (2021/09/29) Initial version
