I've got a couple of useful requirements files I use a lot. It can be
a bit of a pain having to spell out the full directory for them. Would
it be useful to add a --requirements-directory option to pip that's
used to find requirements files when the full pathname isn't given in
the -r option? Obviously, it's not uch use specifying it on the
command line - I see it as mainly for use in a global config file, so
that requirements files can be stored centrally.

If the idea has merit, I can work up a patch for it.

Paul.