Viewtool STM32F107: Add support for an optional, add-on Freescale MPL115A baramoter.  From Alan Carvalho de Assis

gettimeofday() and settimeofday():  Move gittimeofdady() from sched/clock to libc/time.  All remove gettimeofday() from NuttX system calls.  It is only a wrapper around clock_settime() and does not need a trap.  gettimeofday() is no longer tried as a core OS interface.

gettimeofday has been decremented in POSIX 2008.  settimeofday() was never part of POSIX, but I decided to add it to libc as well just for symmetry.

LPC17xx:  Add IPv6 support to the LPC17 Ethernet driver.  Untested... I no longer have a proper environment for LPC17 debug.

SAM4 Ethernet Driver:  No supports operation using the high priority work queue so that packet processing can occur outside of interrupt level processing.

SAM4E-EK: The nsh configuration now configures the Ethernet driver for execution on the HP work thread.

IOB Configuration:  Default number of IOB changes must be more than zero is UDP read-ahead is enabled.

net/:  Lots of build problems introduced into multiple NIC support.  Many places where conditional logic based on CONFIG_NETDEV_MULTINIC is confused with CONFIG_NET_MULTILINK.  Lots of code changed with IPv6 that was never compiled with MULTINIC enabled.  Still some problem with parameter passing.