bookmarks: check bookmark format during rename (issue3662)

color: add additional changeset.phase label to log.changeset and log.parent This allows the user to set different colors for each phase, e.g. [color] changeset.public = blue changeset.draft = green changeset.secret = red In addition, this doesn't affect current configuration for custom log.changeset colors, but rather adds the option for users that want to visually see which changesets are amendable.