Add register definitions for SAM4L BPM and SCIF blocks; SAM4L clock initialization now selects an optimal  power scaling mode
Add register definitions for SAM4L BPM and SCIF blocks
Add flow control support to the STM32 serial driver; Fix some issues with UART2 and 5.  From Lorenz Meier and Mike Smith
Fix a backward conditional that cause the STM32 usb host driver to fail to detect disconnection events.  From Scott
Add SAM4L BSCIF register definition file
Add logic to enable SAM4L clocks
Update SAM4L PLL0 logic
SAM4L:  Add DFLL0 support, add logic to set the power scaling mode, add support for RAM functions
SAM4L: Add logic to enable selected peripherals on power up; Extend configuration so that each peripheral can be selected -- even though the drivers are not yet implemented
SAM4L: Add logic to configure FLASH read mode and wait states
SM4L:  USB clock configuration and WDT register definition file
SAM4L: Add USART/UART register definition header files
SAM3U/4L changes to hide differences by clocking in those MCUs
SAM4L:  Mic fixes to get the SAM4L Xplained running.  The ostest now passes.
SAM4L:  Add an NSH configuration and C++ support
SAM4L:  Extend interrupt support for the larger number of NVIC interrupts of the SAM4L
Beginning updates of SAM3U header files o include support for the SAM4S: WDT, SUPC, EEFC, MATRIX, and PMC
SAM4S:  Add memory map and interrupt logic
Add a directory to hold configurations for the SAM4S Xplained board
SAM4S: GPIO, chip characteristics, peripheral Kconfig