/var/run was cleared out before, but we'd rather not keep it
this way...  It is for pid files, nothing else.  Move the
terrible firmware dirty markers to /tmp instead.  Eventually,
we need a better way to keep track of subsystem state.  Cluttering
multiple files all over the disk is not a good solution.

While there, move the IPv4 sibling and add a require for the remaining
outside caller.

Remove the size settings for those mount points as a preparation,
because tmpfs does not need an upper bound.  Hardcode everything
now, replace mfs with tmpfs in an upcoming commit.

The default is to reboot anyway.  For everybody importing a backup
that has interface mismatches this means the backup did not come
from the same system, so it must be adapted on the console instead.

Caused by:	Omitted /var/run boot up purge

Only a workaround.  Need to take this to FreeBSD.

Show all valid paths, but not 'UTC' as it doesn't exist literally.

(legacy) fix notices on IPv6.inc, we should replace this with https://pear.php.net/package/Net_IPv6/download/1.3.0b1 for 16.1 (but there are some other small changes as well there)