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Creator:  Michael Olson <mwolson@gnu.org>

Improve tq.el.

* lispref/processes.texi (Transaction Queues): Mention the new optional
  `delay-question' argument for `tq-enqueue'.

* lisp/emacs-lisp/tq.el: Improve comments.
  (tq-queue-head-question): New accessor function.
  (tq-queue-head-regexp, tq-queue-head-closure, tq-queue-head-fn):
  Update for modified queue structure.
  (tq-queue-add): Accept `question' argument.
  (tq-queue-pop): If a question is pending, send it.
  (tq-enqueue): Accept new optional argument `delay-question'.  If
  this is non-nil, and at least one other question is pending a
  response, queue the question rather than sending it immediately.