Transition from local `allowed` script to PyPi installation

[densnow]

Since allowed is now on the PyPi, it might be best to transition away from the local allowed.py script? The benefits include:

• Ease of installation
• dependency management
• no need to manually update script for changes
• one or two less files in the GH repo

For Deepnote we would need to update the Dockerfile and for Datalore we would need to update both init.sh and environment.yml. Furthermore, algoesup.py would need to be updated the most obvious part is checkers dictionary but there could be more.

There might be other changes required here, but I think I have covered the main ones.

[mwermelinger]

Good points. If you could test on DeepNote the PyPI version that would be good. (The current PyPI version can't handle folders, but that shouldn't be a problem in the context of DeepNote.)

[mwermelinger]

We still keep the two JSON files because:

• they add the algoesup imports
• the documentation says these two files exist and can be adapted by users
• the example in the docs depends on what the configuration allows.

We could delete both files and add # allowed to the imports to omit messages, but we'd need to update the docs and make them robust to future changes in the configuration on PyPI.