New variables to control VERP-like behavior for better bounce

detection.

VERP_FORMAT: The string (with interpolations) that is used as the
format for VERP'd envelope senders.

VERP_REGEXP: The (unfortunately complex) regular expression which
decodes strings encoded with VERP_FORMAT.  WIBNI Python had a scanf()
equivalent?

VERP_PASSWORD_REMINDERS: A flag which controls whether password
reminders are VERP'd.  This is a golden opportunity because such
emails are already individualized.

VERP_PERSONALIZED_DELIVERIES: A flag which controls whether
personalized regular deliveries are VERP'd.  This is another golden
opportunity because such emails are already individualized.

VERP_DELIVERY_INTERVAL: A variable which controls the frequency with
which to VERP regular, non-personalized deliveries.  0 means never
VERP these, 1 means to always VERP them, and a number > 1 means to
VERP every Nth delivery.

GLOBAL_PIPELINE: Move the ToUsenet handler up to just after the
ToArchive handler.  Also, added some comments.

QRUNNERS: Alphabetize, and also add a BounceRunner now that we're
going to change the envelope sender address so that bounces always
come to listname-bounces@dom.ain.  IOW, we're finally separating
administration from bounce processing, however this /will/ require
folks to regenerate their aliases.  We'll make that easier for them.

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