Allow callers to pass in the dirstate lock in most localrepo.py funcs. This makes it possible to take the lock once and commit a large number of patches, without having to read and write the dirstate for each patch.

revlog.strip should clear the chunkcache The chunkcache isn't valid after a strip, it needs to be cleared out.

Show "(No help text available)" for commands without doc string. Currently this only occurs with "hg help qcommit" from mq extension.

Create default commit message in a more pythonic way.