subrepo: audit subrepo paths

keyword: make repo.commit use a custom commitctx wrapper This avoids forcing the dirstate of overwritten files to normal during a commit. Thanks to Dan Villiom Podlaski Christiansen for the idea of a "double wrapper", so other extensions can still wrap repo.commitctx safely.

commit: lose some pointless 'nothing changed' messages Move message from localrepo to commands. This drops confusing messages in subrepo, import, and rebase.

commit: report modified subrepos in commit editor

verify: demote warning about nullid in copy to note

help: add more pointers to commit --close-branch

branches: add --closed flag for consistency with heads

addremove: build lists of already added and removed files too (issue1696)

addremove: pass unknown and deleted to findrenames directly again

addremove: normalize some variable names

findrenames: drop unused argument defaults

zsh completion: update bisect for builtin syntax