[$] 4.13 Merge window, part 2

By the end of the 4.13 merge window, 11,258 non-merge changesets hadbeen pulled into the mainline repository - about 3,600 since the first half of this series was written.That is nowhere near the 12,920 changesets that landed during the 4.12merge window, but it still makes for a typically busy development cycle.What follows is a summary of the more interesting changes found in thoselast 3,600+ changesets.