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.

mtd/ramtron.c:  Table of parts is not terminated properly if CONFIG_RAMTRON_FRAM_NON_JEDEC is not defined

Big, very risky change:  Remove all occurrences of up_maskack_irq() that disable and enable interrupts with up_ack_irq() that only acknowledges the interrupts.  This is only used in interrupt decoding logic.  Also remove the logic that unconditionally re-enables interrupts with the interrupt exits.  This interferes with the drivers ability to control the interrupt state.  This is a necessary, sweeping, global change and unfortunately impossible to test.