final changes for pmax 4.4-Lite II release
add definition for ability to produce a backtrace
add simple locking primitives
put in request to unmount all filesystems when rebooting
CLK_TCK => 64 (from Ralph)
copied from HP300
more POSIX and ANSI compliance (from karels)
btodb and dbtob need to work with 64-bit numbers (from karels)
fix undefined reference when DEBUG not defined (from ralph)
get disk and block size when opening device rather than probe time (from ralph)
fix problem with disconnects (from ralph)
add istty for spec_open
This change allows things to compile correctly (from ralph).
Fix chip time to GMT convertion so PROM passes self tests anddoesn't reset the chip time (from Ralph)
Bug fix for diskless operation (from NetBSD via Ralph)
Fix for the case when DEBUG isn't defined (from Ralph)
fixes sign extension bug with sending 8 bit chars (from ralph)
move address of boot program. Kernels were getting too large. (from ralph)
changes for procfs (from ralph)
from Ralph
minor debug checking code (from Ralph)
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