Check files for UNIX-style line breaks and 644 permission

[seisman]

Description of proposed changes

Running dos2unix to all Python scripts and check if there are any files changed,
to make sure that we don't include any files with DOS-style line breaks.

The style checks fail due to #734. It also means that the line-break style check works as expected.

However, I can't use /format to automatically fix the line-break issue, as the
slash command dispatch read the workflow in the master branch only.

Address #734.

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.

Notes

• You can write /format in the first line of a comment to lint the code automatically

[seisman]

/format

[weiji14]

I'll leave it up to you if you decide to implement the permissions (x, 755) check here or in a separate PR as discussed at #734 (comment).

Also, we should probably have a policy statement in CONTRIBUTING.md on the use of UNIX style line-endings and correct permissions (644) of files.

[seisman]

Also, we should probably have a policy statement in CONTRIBUTING.md on the use of UNIX style line-endings and correct permissions (644) of files.

I just added one sentence to address the policy.

[weiji14]

Perfect!