status: support commands.status.relative config When the config is set to true, status output becomes relative to the working directory. This has bugged me since I started using hg and it turns it is sillily simple to support it (unless I missed something, of course). We could also add a --relative flag, but I would personally always want that on, and I haven't heard any use for having it sometimes on, so this patch only lets you enable it via config.

plain: ignore [commands] config We only have commands.{update,rebase}.requiredest so far. We should clearly ignore those two if HGPLAIN is in effect, and it seems like we should ignore any future config that will be added in [commands] since that is about changing the behavior of commands. Thanks to Yuya for suggesting to centralize the code in ui.py. While at it, remove the unnecessary False values passed to ui.configbool() for the aforementioned config options.