Fix broken compilation of LUFA under C++ compilers when the Serial peripheral module header file is included in a C++ source file.
Fix missing semicolon in the UC3 architecture host pipe functions.
Fix failed compilation for the XMEGA architecture if USB_DEVICE_ONLY us not specified.
Modify board Dataflash drivers so that each individual board is responsible for including the correct peripheral driver (SPI or SerialSPI) based on the board connections to the Dataflash chip.
Complete A3BU-XPLAINED and B1-XPLAINED board Dataflash drivers.