[racket] path->relative-string/library for collection-linked paths?

From: Danny Yoo (dyoo at hashcollision.org)
Date: Thu May 9 16:53:45 EDT 2013

I'm looking for something like path->relative-string/library, but
where it applies to directories linked up via 'raco link'.  I really
want to avoid duplicating effort if something like this already

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