Fail on missing files when using --files-from=

[static-moonlight]

When coping files with rclone --files-from= the documentation states:

Rclone commands do not error if any names in the --files-from file are missing from the source remote.

However, that is a problem for me. I need to make sure that all files have been copied. So this is a request to put in an option to let --files-from= fail in case files are missing.

I'm also open for any suggestions how to verify that all files (from the given list) are present at the target location.