Formatting: trim trailing whitespace

[Glutexo]

Use the pre-commit-hooks trailing-whitespace-fixer tool to remove all trailing whitespaces from the textual files in the repository. Another pull request #348 adds the tool as a development dependency.

for PATTERN in '*.py' '*.ini' 'README' '*.mako' '*.yaml' '.gitignore' '*.yml' '*.groovy' 'Pipfile' 'Pipfile.lock' '*.md'
do
    find . -type f -name "$PATTERN" | xargs -L1 trailing-whitespace-fixer
done

This is a part of the way towards fixed formatting. See #189 and #331.

[Glutexo]

This has been approved. Merge, @dehort, @lphiri?

[Glutexo]

For those of us who don’t like bash, here is a little script that runs a selected hook on all text files in the repository: https://gist.github.com/Glutexo/be5fe4febba36b7172ca117993bcbfd5 It leverages the fact that the pre-commit-hooks are actually a Python library and can be used not only as a shell command, but as a Python module as well.