Merge branch 'enc-api-doc' into 'v0.9.7'

Improved the Encyclopedia API documentation, made the API input for chemical elements into a list instead of a comma-separated string, added license boilerplate to the CLI command that generates the units.js file.

See merge request !214
8 jobs for v0.9.7 in 25 minutes and 3 seconds (queued for 3 seconds)
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  Test
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passed gui_linting #1209832

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passed install_tests #1209834

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passed linting #1209831

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passed tests #1209833

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