Merged in [8229] from rjsparks@nostrum.com, with minor tweaks:

  From mcr@sandelman.ca:
    Refactor to remove dajaxice.
    Modified the URLs that address schedules:
      - urls now always start with /agenda, removing the mix of /agenda and /schedule prefixes
      - urls to a given schedule include the schedule owner (by email address)
    Corrected issue that prevented deleting sessions.
    Changed comment mechanism in timeslot_edit.js
    Migration to change the email address for (System)
  Fixes bug ietf-tools#1426
 - Legacy-Id: 8319
Note: SVN reference [8229] has been migrated to Git commit fc51268

Author: levkowetz