merge with stable

tests: replace mockmakedate function in test-amend.t This is a follow up patch for D5554. This replaces mockmakedate function by `tests/mockmakedate.py`. Differential Revision: https://phab.mercurial-scm.org/D5577

histedit: add rewrite.update-timestamp support to fold and mess This adds the config option to update time to current in histedit fold and mess options. Setting rewrite.update-timestamp option to `True` will update the timestamp to current time. This also adds `tests/mockmakedate.py` for supplying testable values in case current time is invoked in the tests. Differential Revision: https://phab.mercurial-scm.org/D5554

histedit: remove trailing space from warning message

histedit: fix weird indent of i18n text

progress: specify updatebar() function by constructor argument This makes it easy for ui extensions to intercept progress messages. It also seems slightly nicer in that scmutil.progress doesn't touch ui internals.

progress: change _updatebar() to take parameters as arguments I want to move updatebar() back to ui. See the next patch for why.

archival: construct progress helper through ui.makeprogress() No idea why we didn't.

help: document rewrite.backup-bundle option

repair: move ui.history-editing-backup to [rewrite] section Since we have the "rewrite" section for general history-editing options, the backup option should be there.