Flesh out the Arduino Due board configuratino and integrate it with the build and configuration system

Add peripheral configuration logic for the SAM3X/3A; Change all references to SAM3/4 SPI to SPI0 for compatibity with the SAM3X/3A which has SPI0 and SPI1; Add directory which will eventually holdl an Arduino Due port

Add support for a separate CCM memory allocator for members of the STM32 family that support CCM memory

Straighten out issues about who calls C++ initializers with CXXTEST or HELLOXX are built as NSH applications; Add an ofstream test to CXXTEST suggested by Michael; Update many defconfig fiels to that they set configurations to handle C++ constructors just as before these configuration changes

Fix error in AT91SAM SPI driver introduced in recent comment.  Varioius improvements to README files and debug output

Add support for a generic windows-based EABI toolchain; Add NX configuration to force default NXTK border colors

Correct border colors for SAM3U-EK border; clean up some comments; make sure that sam_vectors.S is identical to stam32_vectors.S

Remove CONFIG_XYZ_BUILTIN configurations, replace with the single CONFIG_NSH_BUILTIN_APPS.  Add SAM3/4 sam_periphclks.h which is just a header file that includes the right header file.  Misc SAM3U-EK cleanup