D6709: config: add --registered flag to show all known configs

[marmoute (Pierre-Yves David)]

marmoute added inline comments.

INLINE COMMENTS

> navaneeth.suresh wrote in test-config.t:232
> that change was there in my patch one revision before. i was asked by @pulkit to modify it as of now. would you recommend writing `no` to `fm.data()` also? the `defaultvalue` was not in `pycompat.bytestr()` after @yuja's suggestion. it would be better if we consider that as a string and change the function accordingly if we want to modify it. otherwise, it should print  `no` and store `False`, print `False` on `hg showconfig --Tjson` in `defaultvalue`.

We should be consistent when printing. And we should also be consistent when recording stuff in data.

I think it make sense to print human friendly version ('yes/no') and use the actual boolean value in data()/json

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6709/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6709

To: navaneeth.suresh, #hg-reviewers, av6, marmoute
Cc: yuja, pulkit, marmoute, av6, mjpieters, mercurial-devel