Cleanup startup.d/00functions.el.

Remove:
  + copy-line
  + delete-word
  + backward-delete-word
  + query-replace-regexp-all-buffers

Changes:
  + insert-date: Doc fix.
  + su: Doc fix.
  + sudo: Doc fix.
  + yank-pop-backwards: Doc fix.  Do not message.
  + insert-file-name: Doc fix.  Use Prefix Arg better.