Move MINIX reboot definitions into minix/reboot.h

Also fix a buffer overflow in commands/reboot/sh_wall.c.

Change-Id: I3a61057c4f0221d1700e14d44520b4ad17f1dbe1
vfs: coredump fix: write zeroes for missing memory
VFS: wikify README

Change-Id: I746f7c8ddabd1e047b8d536df14586c5b1594d55
Importing NetBSD banner
include/paths.h: correct _PATH_MAILDIR
Importing usr.bin/head
Importing usr.bin/whatis

- LSC: fixed missing entry in minix/mi

Change-Id: I5766dd72819e3b15ef24ab49c5ee3a5aa42049c4
Importing usr.bin/from
LIBLWIP - fixed clang warnings
LIBLWIP - updated to LwIP trunk

commit a4a41b9023ef5b3a7c4a1cd82fb167fc63e706df
Author: goldsimon <goldsimon@gmx.de>
Date:   Wed Sep 26 21:50:42 2012 +0200

- This also brings in LwIP's IPv6 codebase

Signed-off-by: Tomas Hruby <tom@minix3.org>
LWIP - fixed makefiles

- Modified libnetsock/Makefile and servers/lwip/Makefile to
  include ipvX headers

Signed-off-by: Tomas Hruby <tom@minix3.org>
LIBLWIP - ARP fix

- does not crash KVM anymore
LWIP - fixed TCP panic when shutting down

- listening sockets do not handle some callbacks
LWIP - avoid crash when an unknown driver come up
LWIP - avoid an assert when a driver restarts
core is not cleaned in libraries

- according to Lionel, no such files are generated

- it conflicts with the core subdirectory in liblwip
lwip (inet's alternative) is compiled by default