* Change arguments to string and regexp search procedures. New

* Change arguments to string and regexp search procedures.  New
  arguments are (PATTERN MARK END #!OPTIONAL CASE-FOLD-SEARCH).

* Reimplement paragraph and region filling commands, to fix bugs and
  create new functionality.  Default region filling is now done by
  paragraphs rather than treating the entire region as a single
  paragraph.

* Implement M-x mail-fill-yanked-message.