localrepo: add "editor" argument to "tag()" Before this patch, "localrepository.tag()" doesn't take "editor" argument, and this prevents callers from passing "editor" argument to "localrepository.commit()" invoked internally. This patch adds "editor" argument to "localrepository.tag()" (and "_tag()", too), and makes "commands.tag()" invoke it with "editor" argument. This patch also omits explicit "localrepository.savecommitmesssage()" invocation, because "localrepository.commit()" will invoke specified "editor" and save edited commit message into ".hg/last-message.txt" automatically.