Before submitting

Please complete the following checklist when submitting a PR:

• All new features must include a unit test.
  If you've fixed a bug or added code that should be tested, add a test to the
  test directory!

• All new functions and code must be clearly commented and documented.
  If you do make documentation changes, make sure that the docs build and
  render correctly by running make docs.

• Ensure that the test suite passes, by running make test.

• Ensure that code and tests are properly formatted, by running make format or black -l 100 <filename> on any relevant files. You will need to have the Black code format installed:
  pip install black.

• Add a new entry to the .github/CHANGELOG.md file, summarizing the
  change, and including a link back to the PR.

• The Mr Mustard source code conforms to
  PEP8 standards except line length.
  We check all of our code against Pylint.
  To lint modified files, simply pip install pylint, and then
  run pylint mrmustard/path/to/file.py.

When all the above are checked, delete everything above the dashed
line and fill in the pull request template.

Context:

Description of the Change:

Benefits:

Possible Drawbacks:

Related GitHub Issues: