Const load

[teubert]

Add feature where constant process load can be applied.

[github-actions[bot]]

Thank you for opening this PR. Since this is a release branch, the PR must complete the release checklist, below:

• [ ] Check that each new feature has corresponding tests

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  • [ ] Check that all desired examples are in docs

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• [ ] Update version number in src/*/init.py and setup.py

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