See dependencies on a directory not just a module

[Benmiller313]

I would find it useful to be able to see the dependencies between modules in one directory and modules in another directory. The most obvious use case would be seeing how tightly coupled a directory is to a projects common directory. The --depends functionality seems to almost provide this, but I think it would be useful if it could accept a directory, or possibly a regex, to see dependencies to a set of modules. I'm happy to work on this but thought I would put it out there incase I'm missing some other way to do it.

[joebowbeer]

I created a filter that I use for this purpose: https://github.com/joebowbeer/repdeps