This patch passes make, make check and a full make doc.
Dan's 17th Dec (2nd) patch's reg test diffs are here: https://cloud-u8zj2dc4b.yourownnet.eu/s/QXJB753MRD8xNnk older: Dan's 15th Dec (1st) patch's reg test diffs are here: https://cloud-u8zj2dc4b.yourownnet.eu/s/JxCkPH4NKsGDkbg Werner's patch's reg test diffs are here: https://cloud-u8zj2dc4b.yourownnet.eu/s/x82NgEnwzKKJykj https://codereview.appspot.com/547340043/
