Allow multiple PATHs to be provided

[garrison]

According to treon --help, treon is meant to be invoked as

treon [PATH] [--threads=<number>] [-v] [--exclude=<string>]...

However, it is currently not possible to pass multiple PATHs, unlike many command-line tools (e.g., cat). If multiple PATHs are provided, the help text is displayed and nothing else happens.

It is possible to exclude multiple paths (#1), but currently, the only way to include multiple paths (e.g., to test multiple notebooks by individual filename or to test multiple directories) is to invoke treon multiple times sequentially, once for each. But this means that the full benefits of multithreading are not available.

[amit1rrr]

Thanks for opening this & sending out the PR to make this improvement.

I agree, accepting multiple paths would be a good addition to treon.