[$] 4.15 Merge window part 2

Despite the warnings that the 4.15 merge window could be either longer orshorter than usual, the 4.15-rc1 prepatchcame out right on schedule on November 26. Anybody who was expectinga quiet development cycle this time around is in for a surprise, though; 12,599non-merge changesets were pulled into the mainline during the 4.15 mergewindow, 1,000 more than were seen in the 4.14 merge window. The first8,800 of those changes were covered in this summary; what follows is a look at whatcame after.