commit: add ability to print file status after each successful invocation When commands.commit.post-status is enabled, `hg commit` will effectively run `hg status -mardu` after committing. It can help catch mistakes like not committing all needed files or not adding unknown files that should've been part of the just created commit.

tests: flatten repo structure in test-commit.t Let's move to parent directory before `hg init` repos, since they don't need to be nested. It makes amend/strip messages that include full path to the backup bundle shorter, for instance.

lfs: add a TODO file This is a cleaned up and reorganized list of items I sent out about a year ago. But tracking this in the repo (like the narrow extension) gives more visibility in case anyone wants to help out.

copies: make "limit" argument to _tracefile() mandatory We always pass a limit. I think the fact that it was optional was also the reason we checked ">=limit" before we used it. So now we can remove that condition too. Differential Revision: https://phab.mercurial-scm.org/D6335