localrepo: move store() from store module
I want logic related to requirements handling to be in the localrepo
module so it is all in one place.
I would have loved to inline this logic. Unfortunately, statichttprepo
also calls it. I didn't want to inline it twice. We could potentially
refactor statichttppeer. But meh.
Differential Revision: https://phab.mercurial-scm.org/D4574
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