and fixed the node delete form to use a return destination.

  Generally improves readability; gets rid of technical jargon; provides
  concrete example; provides suggestions for how permissions can be used.

- Modified patch #18656 by Moshe: unifies the admin comment form and the usual comment form, similar to what we did for nodes. This resulted lots of duplicate code removal.  Also gave administrators the ability to change the author and timestamp of a comment.  Also removed comment links from the bottom of the comment preview box (as we did for nodes)

  Modifications: fixed breadcrumbs, tidied up delete confirmation page to be consistent with node deletions..

- Modified patch #20505 by Morbus: fixed scalability issues with terms, tried to create a better distinction between vocabularies and terms, fixed problem with term pager (temporary fix).

  TODO: update image module too?

  TODO: update migration page in handbook.

  Also replaced some double quotes by single quotes.

- Patch #25354 by Thox: fixed Javascript caching.  Faster response and less server traffic for matches previously found.