MFC rev 1.6: remove ``cwd'' and fix table heading.
MFC rev 1.13: remove cwd from MLINKS
MFC: sync up with hard links instead of duplicate mknods (consuming
seperate inodes).  Also provide non-'r' tape node names.  Fix ttyA/cuaA.
MFC: .Xr vgl 3 ,
MFC: Bugfixes when viewing previous file
Copy From Current: ordered includes, exit on eof, errno.h
MFC: some fabric && WWN related fixes, plus some bothces about overwriting
busses with pending Sendmarker operations.
MFC: add a watchdog timeout routine
MFC: roll platform minor
MFC: put in the right place NA_RST_CLRD
MFC: clean up some prototpes
MFC: clarify some comments
MFC: protect macro with parens
MFC: it is PORT not NODE for WWN in NVRAM
MFC: roll core minor. Add definitions for topology.
MFC: add SA_QUIRK_NO_MODESEL && do not get derailed if setting buffered mode fails
MFC rev 1.2: Fix Nd.
MFC: Added PC-98 supports.
MFC: Add '-DPC98' to CFLAGS if MACHINE == pc98.
MFC: Fix miscellaneous mdoc macro argument limit infringements.