Turns off packet counts.
(Later add code for packet counts to be optionaly turned on by -a if wanted).

I only needed this so far on 6.4-RELEASE, maybe later I'll write a
patch for 9.1 if I need it there.

Packet counts make it impossible to diff similar sets of rules.
Reason to do that: To catch missing rules: Some rules get rejected
& not applied at first run of /etc/rc.firewall just after boot, as
text names are not resolved by named, only numeric IP names are OK
that early.  named only later is capable of resolving text names.
Not sure if reason for named not resolving is that named is not
running or no DSL connection that early ?  (just as well no connection
before firewall ready !), When debugging /etc/rc.firewall by
inserting:
	ipfw show > /var/log/ipfw.rules.`date +%Y-%m-%d_%H:%M:%S`
one previously could not later run a diff as every line was different
because of packets counts.

*** 6.4-RELEASE/src/sbin/ipfw/ipfw2.c	Fri Aug 23 22:27:52 2013
--- New-generic/src/sbin/ipfw/ipfw2.c	Fri Aug 23 22:29:30 2013
***************
*** 5299,5305 ****
  	else if (_substrcmp(*av, "disable") == 0)
  		sysctl_handler(ac, av, 0);
  	else if (_substrcmp(*av, "show") == 0)
! 		list(ac, av, 1 /* show counters */);
  	else
  		errx(EX_USAGE, "bad command `%s'", *av);
  
--- 5299,5305 ----
  	else if (_substrcmp(*av, "disable") == 0)
  		sysctl_handler(ac, av, 0);
  	else if (_substrcmp(*av, "show") == 0)
! 		list(ac, av, do_acct /* show counters if do_acct==1 */);
  	else
  		errx(EX_USAGE, "bad command `%s'", *av);
  
*** 6.4-RELEASE/src/sbin/ipfw/ipfw.8	Sat Aug 24 01:07:55 2013
--- New-generic/src/sbin/ipfw/ipfw.8	Sat Aug 24 01:09:46 2013
***************
*** 190,196 ****
  While listing, show counter values.
  The
  .Cm show
! command just implies this option.
  .It Fl b
  Only show the action and the comment, not the body of a rule.
  Implies
--- 190,197 ----
  While listing, show counter values.
  The
  .Cm show
! command no longer implies this option,
! (because it obfuscated comparison of similar rule sets).
  .It Fl b
  Only show the action and the comment, not the body of a rule.
  Implies