This patch against pine3.95q (which probably works against 3.96 as well)
implements the following features:

- (written by "Randall S. Winchester" <rsw@Glue.umd.edu>) Add a "Recipients"
    option to the aggregate selection -- similar to doing a selection by To
    and then broadening with a selction by Cc... useful when you want to
    know all the messages that a certain address received.

- defines ALLOW_CHANGING_FROM in pine/osdep/os-lnx.h so that From can be
    changed

- adds a new define ALLOW_DISABLE_SENDER which enables a new option
    disable-sender, suppressing the generation of Sender: and X-Sender:.
    (defined in pine/osdep/os-lnx.h as well)

- adds a new define QMAIL_RETURN_PATH which enables a new option
    qmail-return-path which uses the qmail feature whereby the envelope
    sender can be set by putting a Return-Path header into the message.
    By default the Return-Path: will contain a copy of the From:, but if
    you add Return-Path to your customized headers you can use any
    combination of From: and envelope sender you want.
    (defined in pine/osdep/os-lnx.h as well)

You will need to define those features in whatever osdep file is appropriate
for your system to make use of them.

  Written by: Dean Gaudet <dgaudet@arctic.org>