Add main library makefile target "export_tar" to export a copy of the library codebase in TAR format, for each integration into user applications.

Reverted AVRISP-MKII clone project watchdog based command timeout patch in favour of a hardware timer, to allow for use in devices with WDTRST fuse programmed.

Removed variable axis support from the HID_DESCRIPTOR_JOYSTICK() macro due to OS incompatibilities, replaced with fixed 3-axis joystick report structure.

Added additional bootloader API data to expose the bootloader start address and class to the DFU and CDC class bootloaders.

Tweak static analysis check BuildTest makefile argument order to make the call differences easier to determine.

Re-enable cppcheck static analysis unused function checks after adding in special-case suppressions to the event stub functions. Add missing function prototypes to the AudioInput and AudioOutput class driver device demos.

Fixed AVRISP-MKII programmer project failing to compile for the U4 chips when VTARGET_ADC_CHANNEL is defined to an invalid channel and NO_VTARGET_DETECT is defined (thanks to Steven Morehouse).

Remove unnecessary GCC_MEMORY_BARRIER() at the end of GetGlobalInterruptMask().

Minor documentation improvements.

Fixed incorrect call to the user callback CALLBACK_Audio_Device_GetSetInterfaceProperty() in the Audio Class device driver (thanks to Tiit Ratsep).

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.

Fixed compile error for the UC3 architecture when INTERRUPT_CONTROL_ENDPOINT is specified (thanks to Andrus Aaslaid).

Raised the guard bits in the AVRISP-MKII clone project when in PDI and TPI to 32, to prevent communication errors on low quality connections to a target.

Update code and StaticAnlysisTest so that missingInclude warnings do not have to be suppressed, and so that all code except for third party libraries can be checked.

Update SingleUSBModeTest makefile to separate out the messages from the test commands.

Update ModuleTest to compile for each sub-family within each architecture, to ensure that the code compiles for all devices (not just for one device in each architecture).