don't use GCC-isms in MI code (from cgd)
multi-page interface for get/put.
convert pager list to use <sys/queue.h>
finish up new device pager: all pagers get offsets
4.4BSD snapshot (revision 8.1); add 1993 to copyright
added VM_PAGER_ERROR to reflect pager IO errors
add function prototypes
fix includes; new proc struct; rm *_NULL
adopted from Mike Hibler at Utah