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add: pass around uipathfn and use instead of m.rel() (API)

Authored by martinvonz.

Description

add: pass around uipathfn and use instead of m.rel() (API)

For now, the uipathfn we pass around always prints relative paths just
like before, so this should have no effect. Well, there's one little
change: I also made the "skipping missing subrepository: %s\n" message
relative.

Differential Revision: https://phab.mercurial-scm.org/D5901