mhexternal.pl switch, message deletion switch

[Jeff Breidenbach <jeff@jab.org>]

Earl,

1) Are you still thinking about modifying the mhexternal.pl to support
   exclusion of files based on filename regexp and/or content type? I'm
   about ready to declare a vendetta on image/jpeg.

2) Any chance of adding a resource to disable message deletion? (i.e.
   I can have a constant size .mhonarc.db through MAXSIZE but
   unlimited message files). I'm currently using patched code to
   achieve this.

Jeff