view i18n/polib.LICENSE @ 47071:3e381eb557f3

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

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