Interrupt changes, Pending Configuration.ioc rebuild.
Configuration.ioc correction and rebuild.  Added true external IRQ (EXTI 4) to (EVP4 implementation of) CC3000 wifi.
Manual edit to gpio.c paired w/ioc correction.
Brand new IRQ structure.  Using all 4 bits for pre-emption, no sub-priority.  7 used, out of 16 levels total.  ETH_IRQn has been "stolen" for processing rx packets at a reduced interrupt priority.  (Needs testing)

Additional code/interrupts need to be added to service items at a reduced interrupt level - relieving the systick() of heavy, intervaled, operations which should run at reduced priority.