Remove an extraneous check for dtoa returning Inf/Nan

Decimal point was missing for some exponential output
Only divide sign by 10 once per loop
Add a missing NUL terminator for one case
If there is no whole number portion, print a leading zero (e.g. 0.1 not .1)

1997 (yes, really).

Add new sys/_types.h header
Include machine/_types.h or sys/_types.h where applicable

drivers, and to wscons as the console; a few parts borrowed from OpenBSD/macppc
as well.
Currently only working with displays configured in 1bpp or 8bpp modes; this
limitation will be worked on ASAP.
Tested by claudio@ kettenis@ martin@ nick@ and I on various models. X11 changes
coming soon.

Use correct values for _POSIX_TTY_NAME_MAX and _POSIX_LOGIN_NAME_MAX
Define MAXLOGNAME in terms of LOGIN_NAME_MAX
OK krw@

separate errno.h.  sys/errno.h now only contains errno values (which
is included byerrno.h).  OK deraadt@

dev/fd comment and point to fd(4).

a long time, but i'm a bloody slacker...

OK deraadt@

in sys/cdefs.h) instead of _FOO_SOURCE.  Also fix several namespace
pollution issues, including the byte order defines.  OK deraadt@

validate this condition and reject multicast traffic on failure.
ok todd@ naddy@

also start ntpd at this time.
discussed with jmc@; ok deraadt@

and remove fallback code. If somebody is dumb enough to make the
sysctl fail using systrace, he deserves what he gets. Saves 7 syscalls
on process startup.
looks good miod@ ok deraadt@ tedu@

userland-visible sys/select.h.  Consistent with what Net and Free do.
OK deraadt@, tested with full ports build by naddy@.

/root instead of hard links to them.  This way multiuser only changes
a user makes to the to the ones in /root do not screw them over for
getting into single user easily when the have to.
ok millert@

the official assignment by the IANA for the IEEE 802.11f Inter Access
Point Protocol on port 3517 is 802-11-iapp, we use it as an alias.
ok jakob@, deraadt@

should take intptr_t, not int, but we don't presently have intptr_t
available from unistd.h.  OK marco@

ok millert@

jason@. Man page fixes by jmc@, prodding by jsg@. ok mickey@

(not really useful for now, it mostly helps some programs which want
to use it, it will become useful when we have full 16 bits locale).

ok henning beck

ok deraadt@ mickey@