add regression tests for some m4 problems I recently found relating
to confusing 0xff characters with EOF.
Don't print newline at beginning of line.
When building fake disklabel, if a partition type is other than FS_UNUSED
don't override it so that port specific hack takes effect.
clarify /etc/ftpwelcome is shown *before* login
Fix a typo in panic string.
Implement a queue for delayed ACK processing.  This queue is used in
tcp_fasttimo() in lieu of scanning all open TCP connections.
Change an exit() to _exit(), so that it's safe for vfork().
Change an err() to a warn()/_exit(), so that it's safe for vfork(), and
fix the error message that's displayed if the vfork() fails.
Change an exit() to _exit(), so that it's safe for vfork().
Change a couple of exit()s to _exit(), so that they're safe for vfork().
Change an exit() -> _exit(), so that it's safe for vfork().
Prototype wwterminfoinit() and wwterminfoend().
Pull in prototypes, RCS IDs, and make this safe for vfork().
Change a couple of exit()s to _exit(), to make it safe for vfork().
Split out the code that prepares a VM space for exec into a new
vmspace_exec() function.
Make pmap_activate() and pmap_deactivate() take a struct proc *.
Add kernfs; remove more stuff we don't need.
Remove a couple of unneeded VM-related headers.
No longer needs to include sys/shm.h.
Fix usage; -i and -C flags are alway effective regardless of NUMBOOT.