revlog: preserve `_lazydelta` attribute in `revlog.clone` The attribute was introduce in 688fc33e105d, Yuya Nishihara pointed out that this preservation was missing. This changeset fixes the preservation and make sure we set the attribute according the modes.

localrepo: explicit `_lock` arguments in `lock` The argument for `_lock` are non-trivial, having them passed explicitly makes thing clearer in my opinion. This is a Gratuitous change, I expect it will save me (and others) time in the future.