subrepo: subrepo isolation, pass baseui when cloning a new subrepo (issue2904) Create the repo with baseui because it should only get the global configuration. After this patch issue2904 is finally fixed.

subrepo: more isolation, only use ui for hg.peer when there is no repo ui contains repo specific configuration, so do not use it when there is a repo. But pass it to hg.peer when there is no repo. Then it only contains global configuration.

peer: subrepo isolation, pass repo instead of repo.ui to hg.peer Do not pass ui because it contains the configuration of the repo. It is the same object as repo.ui. When a repo is passed to hg.peer, the global configuration is read from repo.baseui.

subrepo: isolate configuration between each repositories in subrepo tree Before this patch, repository local configurations are not isolated between repositories in subrepo tree, because "localrepository" objects for each subrepositories are created with "ui" instance of the parent of each ones. So, local configuration of the parent or higher repositories are visible also in children or lower ones. This patch uses "baseui" instead of "ui" to create repository object: the former contains only global configuration. This patch also copies 'ui.commitsubrepos' configuration to commit recursively in subrepo tree, because it may be set in not "repo.baseui" but "repo.ui".