Changes from John Dyson and myself:

1) Removed all instances of disable_intr()/enable_intr() and changed
	them back to splimp/splx. The previous method was done to improve
	the performance, but Bruces recent changes to inline spl* have
	made this unnecessary.
2) Cleaned up vm_machdep.c considerably. Probably fixed a few bugs, too.
3) Added a new mechanism for collecting page statistics - now done by
	a new system process "pagescan". Previously this was done by the
	pageout daemon, but this proved to be impractical.
4) Improved the page usage statistics gathering mechanism - performance is
	much improved in small memory machines.
5) Modified mbuf.h to enable the support for an external free routine when
	using mbuf clusters. Added appropriate glue in various places to
	allow this to work.
6) Adapted a suggested change to the NFS code from Yuval Yurom to take
	advantage of #5.
7) Added fault/swap statistics support.

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