Make dxchange and olefile optional requirements

[hrobarts]

Changes

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Please add any demo scripts to https://github.com/TomographicImaging/CIL-Demos/tree/main/misc

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• I have performed a self-review of my code
• I have added docstrings in line with the guidance in the developer guide
• I have updated the relevant documentation
• I have implemented unit tests that cover any new or modified functionality
• CHANGELOG.md has been updated with any functionality change
• Request review from all relevant developers
• Change pull request label to 'Waiting for review'

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• The content of this Pull Request (the Contribution) is intentionally submitted for inclusion in CIL (the Work) under the terms and conditions of the Apache-2.0 License
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[casperdcl]

• you'd have to add olefile to run_constrained
• you'd have to add zenodo_get, olefile, dxchange, ipywidgets, etc to the README table's "optional deps" rows
• you'd be violating conda's lack of first-class support of trivial optional deps
  • conda install pkg was designed to be equivalent to pip install pkg[all]
  • alternatively could have a separate package conda install cil-base (similar to matplotlib-base approach)

[casperdcl]

reopening for future discussion

[gfardell]

As long as these are in the environment files I think we're good to merge. Maybe in the table we can add CT data reader dependancies as a sub section as this is where most of our small packages come in and won't be universally needed or wanted.

[hrobarts]

As long as these are in the environment files I think we're good to merge. Maybe in the table we can add CT data reader dependancies as a sub section as this is where most of our small packages come in and won't be universally needed or wanted.

Hi @gfardell, yes dxchange and olefile are in the cil_demos, cil_demos_cpu and cil_test environment files. zenodo_get isn't in them but I will add them now.

I've added olefile and dxchange to the dependency table in the README. As discussed I also moved the installation with the env files to the top of the installation instructions section and added a note on how to rename the environment and activate it.