Show internal system names of permissions

As a developer aid, Xray module (perhaps Devel module is a better home) should show

Cannot find anyone else addressing this issue. (Intro to module dev chapter of Definitive Guide to Drupal 7 does describe how to find it through the database or grep.) But no other mention i can find, nor an aid to do this. See: http://data.agaric.com/raw/see-drupal-7-permissions-internal-system-names