Revert PR #1887

[brunaccampos]

Description

This PR reverts the changes made in #1887 except the documentation of functions.

Testing

Documentation

Miscellaneous (will be removed when merged)

Checklist (will be removed when merged)

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Code related list:

• All in-code documentation related to this PR is up to date (Doxygen format)
• Copyright headers are present and up to date
• Lethe documentation is up to date
• The branch is rebased onto master
• Code is indented with indent-all and .prm files (examples and tests) with prm-indent
• If parameters are modified, the tests and the documentation of examples are up to date
• Changelog (CHANGELOG.md) is up to date if the refactor affects the user experience or the codebase

Pull request related list:

• No other PR is open related to this refactoring
• Labels are applied
• There are at least 2 reviewers (or 1 if small feature) excluding the responsible for the merge
• If this PR closes an issue or is related to a project, it is linked in the "Projects" or "Development" section
• If any future works is planned, an issue is opened
• The PR description is cleaned and ready for merge

[blaisb]

Looks good from my side @brunaccampos :). I will just not squash and merge it

[brunaccampos]

Looks good from my side @brunaccampos :). I will just not squash and merge it

I think actually you can do squash and merge it; if later we want to go back and re-revert this, we would bring back only the changes of tests to prototypes (meaning that this PR is not connected anymore to the previous one #1887), no? I haven't done this before so whatever you think works best!