Major kernel VM pmap work in master

I’m jumping ahead in my very full queue of DragonFly items to post to something new: Matthew Dillon has committed extensive work to the virtual memory system in DragonFly.   He has a message to users@ that sums it up.

If that’s not enough reading for you, I’ll point at commits where he reports speed improvements, changes to systat(1), or just 2-decade-old copyright items.