Add build targets for source code formatting

This makes it possible to run:

• make format-fortran to format Fortran source files with fprettify;
• make format-c to format C/C++ source files with clang-format;
• make format that does both.

Although .clang-format is there, most (if not all) of the C/C++ source files in the repo are not formatted according to it. I don't want to mess with the authorship of the lines in git blame, so I leave it to the core developers to decide what to do about it.

If this is accepted, it should replace the existing logic in the CI, I guess.

requested review from @b381660

@b382190 @b381001, please, take a look

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• 774ccc87 - Add make target 'format'

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mentioned in merge request !25 (merged)

Thank you very much for adding the format target. This is very useful.

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• b0d27692 - Add make target 'format'

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resolved all threads

merged

mentioned in commit 1b6af435

@b382190 I would like to merge this before any other MR that I have submitted. So, please, merge this if it's fine with you and create a follow-up MR that reformats the files (it's up to you how to handle the authorship of the commits). After that, I will rebase the rest of the MRs and do the reformatting there.

P.S. You already merged, thanks!

mentioned in merge request !28 (merged)