Add DEBUG_FORMAT and DEBUG_LEVEL optional parameters to the BUILD module. Turn off generation of debug information when performing a validation build, and when running the build tests.

Minor makefile fixes - add phony targets, remove silence switch from the root makefile and add missing build modules to the ClassDriver VirtualSerial device demo.

Remove space padding on the current time when automatically generating AVR Studio 4 project creation/modification timestamps.

Oops - shell variables can't use the += operator - must reference the existing value in the new value to append.

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

Update project Doxygen and makefiles so that the resulting project documentation hides the unused version value, and uses the same HTML CSS stylesheet as the library core.

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

Audio Device Class driver changed to also require the index of the Audio Control interface within the device, for SET/GET/CUR/MIN/MAX/RES property adjustments.

Added Dataflash operational checks and aborts to all projects using the Dataflash to ensure it is working correctly before use.

Update maintenance scripts to add targets to validate the current branch for complete correctness. Add maintenance script target for checking for release suitability.

Prevent the first maintenance script rule from running if no target is specified to the maintenance script.