Usernames can now be themed; eg. an icon/avatar could be added.

  TODO: update contributed modules + update the migration docs.

- Patch by Neil: removed redundant form_group() from throttle settings page.

- Patch #27863 by Robrecht: fixed order of parameters passed to imagecopy().  Could result in black images.

  + made it possible to specify a subject when submitting a message on the contact form.
  + fixed some bugs/glitches.

  "This function is called in one place, so it can be rolled into the calling function. The return value isn't used so we can remove handling of it. This is executed for every non-cached page view, so the smaller code should save a smallish ammount of memory and time."

- (#15121) Improve string cut-off for locale table

- (#15121) Improve string cut-off for locale table