allow ELFSIZE to be pre-defined
add MTIOCTOP/MTEWARN option to enable/disable Early Warning EOM behaviour
__Namespace__ __protection__.
Regen.
opt_scsiverbose.h now is opt_scsi.h and contains the defopted
SCSIVERBOSE and the new ST_ENABLE_EARLYWARN.
Split vm_offset_t and vm_size_t into paddr_t, psize_t, vaddr_t, and vsize_t.
Cleanup work:

	Sync up with sys/dev/sbus
	get cgsix to work right
make it compile in paddr_t world
Revert cdevsw mmap routines to return int.
General pmap and debug cleanup.  Added PMAP_NEW support, but it doesn't work too well yet.
Protect XOPEN and POSIX code from vm_offset_t, paddr_t, vaddr_t, vm_size_t, psize_t, and vsize_t.
Give DDB access to all the nice symbols in locore.s
Fix a debug printf if paddr_t == long long.