Log Message:
Update to 2.2.1. Changes:

2.2.1		2007/09/07
	Insert VBR headers at the top rather than appending them to be
		sensitive to legacy DomainKeys operations.  Patch from
		S. Moonesamy of Eland Systems.
	Discontinue use of MAXHOSTNAMELEN as the maximum size of a hostname
		since some vendors set it to 64 (maximum size of a DNS label)
		and some to 256 (maximum size of an FQDN).  Instead, define
		and use DKIM_MAXHOSTNAMELEN (256).  Problem noted by
		Jeff Barry.
	LIBDKIM: Rename and update the default_signhdrs and default_skiphdrs
		arrays to match what's in RFC4871 section 5.5 SHOULD and
		SHOULD NOT lists.
	LIBDKIM: Apply DKIM_OPTS_SKIPHDRS only when signing.
	LIBDKIM: Add missing entries to prv_results, and add a
		dkim_getresultstr() function for translating DKIM_STAT
		result codes.  Patch from Kaspar Brand.
	Fix bug #SF1785624: Resolve build problem introduced in previous
		version when NETINET6 is in use.  Reported by Andrew Benham.
	Fix bug #SF1786033: Resolve build problem introduced in previous
		version affecting later versions of Solaris.  Reported by
		Andy Fiddaman.
	Fix bug #SF1787473: Initialize the default "-i" list properly (given
		changes made in the previous version) so that mail from
		localhost still gets signed.  Reported by Graham Murray.

2.2.0		2007/08/30
	Change format of the peerfile, internal and external host lists, etc.
		to allow exclusion entries.  See the man page for additional
		details.
	Amend "-u" to include the ability to name a group into which the
		filter process should be placed.
	Feature request #SF1783155: Make keylist pattern matching
		case-insensitive.
	LIBDKIM: Handle CNAMEs properly when using the standard resolver.
		Problem noted by Jim Fenton of Cisco.
	LIBDKIM: Fix bug #SF1782076: Adjust signature header wrapping logic
		so that a "b=" against the margin gets wrapped consistently
		when signing and verifying.  Reported by Kaspar Brand.

In addition, we don't use libar by default anymore since the libdkim
bug which required this default was fixed in 2.2.0.