MIPS:  Add some build support for the M14K and also for the PIC32MZ Starter Kit.  Still a long way to go

Add basic board support for the PIC32MZ (can't build yet of course because there is not yet any PIC32MZ support)

Add path for Pinguino tools.  Need to be careful because bin directory has an incompatible make.exe in it

pic32mx-starterkit: Move scripts to common directory.  Pinguino build needs to use a different linker script

pic32mx-starterkit: Move scripts to common directory.  Pinguino build needs to use a different linker script

Rename pic32-starterkit to pic32mx-starterkit to make room in the namespace for the pic32mz-starterkit

STM32: Fix for compilation introduced by last backup RAM change.  Not sure it it is correct, be now things do compile

Adds the ability to use the STM32F2 and STM32F4 Battery Backedup SRAM in the file system. With an option to Save Panic context to one of the files. From David Sidrane.

Changes to support fully write protecting the backup domain. N.B. stm32_pwr_enablebkp did not account for the delay from enable to the domain being writable. The KISS solution is a up_udelay. A more complex solution would be a negated write test with restore.  From David Sidrane.

Tiva: Move GPIIO prototypes out of arch/arm/include/tiva/irq.h to arch/arm/tiva/tiva_gpio.h where they belong

Fix some time value changes; mostly changing greater than 1000000000 to greater than or equal to 1000000000.  From Juha Niskanen