Various test workspaces and images to excercise nip and VIPS

also convert.sed, a sed script which should update older workspaces to
work with 7.14

usage:

	sed -f convert.sed oldworkspace.ws > newworkspace.ws

or

	#!/bin/bash

	for i in $*; do
		sed -f /home/john/SVN/vips/nip2/trunk/test/convert.sed $i > fred
		mv fred $i
	done
