Strn has a "verify signature" option.

	While reading an article, type control-V to attempt to verify a
RIPEM or PGP signature.  Strn will scan the article looking for the text:

BEGIN PRIVACY-ENHANCED MESSAGE (for RIPEM)
or
BEGIN PGP SIGNED (for PGP)

	If one of these is found, the entire article (headers and all)
will be passed to the appropriate program.  The default commands are:

ripem -d -Y fgs -i article_file
and
pgp +batchmode -m article_file

	These can be changed with the variables (environment or strnrc):
VERIFY_RIPEM or VERIFY_PGP.  Here is a sample of a different RIPEM
verification command:
value VERIFY_RIPEM ripem -d -Y f -i %A
                                     \--- use %A to represent the
                                          article's file name

	I hope to enhance the verify signature command later, allowing
more signature methods to be recognized and allowing custom routines
to be used.
