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

* remotes/upstream/master:
  more error handling
  ensure all new users get a timezone. We'll use UTC until they choose otherwise.
  handle escaped file chars in display and search
  escape % in file_tag_query as it is ultimately embedded in a sprintf
  diabook-themes: move "common tabs" to left side on settings page
  move the common tabs to right_aside in diabook-derivates
  register hooks for a COPA plugin
  some js fixes - ignore backspace as history selector and cleanup errors closing non-existent menus
  bug fix in diabook-aerith and -red
  bug-fixes in diabook-derivates
  settings for unknown private mail acceptance

* master: