Fix up makefile .NOTPARALLEL heuristics so that linear building is only enforced if no object folder set and the "all" target is run. Rename library "ConfigDescriptor.c" file to "ConfigDescriptors.c" to ensure that object filenames are unique.

Add missing documentation to custom BuiltTest hardware mapping files. Fix up old copyright years on some makefiles.

Fixed compile error with the unreleased ATMEGA32U6 device.

Add branch for the conversion of demos to use standard C header files for configuration, rather than makefile defined macros.

Speed up build tests by only building each test to the ELF output stage (when all files are compiled and linked), rather than to the full HEX output stage as the resulting binary is not actually required.

Fix UC3 Interrupt Management platform driver not compiling under C++.

Add build tests to verify correct compilation of as many modules as possible under as many architectures as possible.

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.