svenaas's sandbox: User Cancel Permission

Drupal itself provides a single, coarse "Administer users" permission which covers creating, updating, and cancelling/deleting user accounts. But given the impact and irreversibility of some user cancellation methods, it may be desirable to restrict this ability to a subset of administrators (or solely to user 1). This module adds a "Cancel user accounts" permission to provide separate control of access to cancellation and deletion.