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config: add --source option to include source of value

Authored by martinvonz.

Description

config: add --source option to include source of value

Showing the source of each config option is quite useful and not
something the user should have to reach for the --debug flag for.

I updates documentation and tests, except for one place in
test-hgrc.t where I thought the test might have been intended to
also test that --debug results in ui.quiet etc being test.

Differential Revision: https://phab.mercurial-scm.org/D10668