Some weekend stable kernel updates

The4.18.18,4.14.80,4.9.136,4.4.163, and3.18.125stable kernel updates have all been released; each contains a relativelylarge set of important fixes.

The 3.18.x updates may be about to come to an end, since it is not clearthat anybody is using them. "And from what I cansee in the 'real world', no one is actually updating devices that relyon 3.18.y to the newer kernel releases. So I think I'm going to stopmaintaining this tree soon unless someone speaks up and says 'I am usingit!''