config: graduate experimental.updatecheck to commands.update.check .. feature:: New `commands.update.check` feature to adjust constraints on when `hg update` will allow updates with a dirty working copy. also .. bc:: The `experimental.updatecheck` name for the new `commands.update.check` feature is now deprecated, and will be removed after this release. Differential Revision: https://phab.mercurial-scm.org/D1070