Fix to "Pnews" of "rn" version 4.3.1.3.

[Stephen J. Muir]

If I post to 'general', 'uk.general' or 'eunet.general', I would like to see
the "Followup-To: " field set to the appropriate '*followup' newsgroup.  Here
is a patch to do this:

*** Pnews.header.orig	Thu Aug 22 21:38:39 1985
--- Pnews.header	Thu Aug 22 21:38:39 1985
***************
*** 100,107
  done
  
  case $ng in
! *net.general*)
!     follow=`echo "$ng" | sed 's/net\.general/net.followup/g'`
      ;;
  *)
      follow=""

--- 100,107 -----
  done
  
  case $ng in
! *general*)
!     follow=`echo "$ng" | sed 's/general/followup/g'`
      ;;
  *)
      follow=""
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