- add support for ignoring files and directories from comparison

through an optionnal /etc/sysmerge.ignore file
requested by many
man page tweak from jmc@
/etc/changelist addition suggested by sthen@
ok sthen@ jdixon@ jmc@ naddy@

src/etc/changelist

@@ -1,4 +1,4 @@
-#	$OpenBSD: changelist,v 1.57 2008/06/08 03:03:37 jdixon Exp $
+#	$OpenBSD: changelist,v 1.58 2008/06/13 00:46:57 ajacoutot Exp $
 #
 # List of files which the security script backs up and checks
 # for modifications.
@@ -131,6 +131,7 @@
 /etc/suid_profile
 /etc/sysctl.conf
 /etc/syslog.conf
+/etc/sysmerge.ignore
 /etc/ttys
 /etc/usermgmt.conf
 /etc/weekly