JOE 4.0

• JOE now has pop-up shell windows with full terminal emulation and shell commands
  that can control the editor. Hit F1 - F4 to bring up a shell window.
  See Pop-up shell feature for a full description.

• The status command (^K SPACE) can now be customized using the same syntax
  as the status bar. Look for smsg and zmsg in joerc to see how to do this.

• parserr (the error parser) will parse only the highlighted block if it's set. Before it always parsed the entire buffer.

• Now there is a per-buffer concept of current directory. This was added to
  make the pop-up shell windows work better, but it's useful in general.

• At file prompts you can begin a new anchored path without having to delete
  the old one. It means that ~jhallen/foo//etc/passwd is translated to /etc/passwd.
  Prompt windows are now highlighted to indicate which parts of the path are
  being dropped. There is a syntax file for this: filename.jsf

• The error parser now ignores ANSI sequences (some versions of grep
  color their results, now JOE can still parse it).

• Temporary messages are now dismissed by keyboard input only. Before, they
  could also be dismissed by shell input.

• Tags search now supports multiple matches. ^K ; can be configured to
  either provide a menu of the matches or to cycle through them.

• Tags search will now match on the member name part of member functions
  ('fred' will match 'myclass::fred').

• Tags search will prepend the path to the tags file file name in the tags
  file. This is important when JOE finds the tags file via the TAGS
  environment variable.

• Remove ` as quote character from incremental search.

• Clean up documentation, convert much of it to Markdown.