Merge remote-tracking branch 'remotes/upstream/master'

Merge remote-tracking branch 'remotes/upstream/master'

* remotes/upstream/master: (21 commits)
  more logging on pubsub callbacks
  provide ability to autofriend ostatus accounts
  ostatus hub subscription issues
  better events-reminder theming
  png support for embedded private photos
  rev update
  png support: update database.sql, fix some typos, fix tinymce image browser
  Add support for PNG images with alpha
  fix a random profile error message
  events: fix select events query select events that starts before display start date and/or ends after display end date.
  more logging on subscribe_to_hub
  admin page untranslated strings, remove empty list element for update
  A few corrections in German translations.
  rev update
  set minchars to 2 for PM lookups too
  set minchars to 2 for contacts search
  contacts search autocomplete
  add email probe logging, limit typo check to main addon files and skip additional support files
  rev update
  named anchors on display page
  ...