Added new RESET_TOGGLES_LIBUSB_COMPAT compile time option to the AVRISP-MKII clone programmer project (thanks to Robert Spitzenpfeil).

Additional fixes to the MIDI host driver due to not unfreezing/re-freezing pipes correctly (thanks to Michael Brown).

Upgrade Doxygen configuration files for Doxygen 1.8.1, fix broken stylesheet and footer HTML, add explicit spacing into documentation code fragments to prevent Doxygen from removing empty lines in the output.

Minor documentation adjustments to the demos, projects and bootloaders to ensure correct formatting of application device support.

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.

Clean up and speed up build tests by turning off expensive and slow size optimizations, and generation of assembly listings (*.lst) for each compiled source file.

Fixed compile error with the unreleased ATMEGA32U6 device.

Fix broken documentation in the CDC and DFU class bootloaders due to Doxygen's confusion over the ATTR_NO_INIT attribute macro.

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.

Changed board LED driver implementations of LEDs_ToggleLEDs() for the AVR8 architecture to use the fast PIN register toggle alternative function for speed.

Fixed broken MIDI host driver MIDI_Host_ReceiveEventPacket() function due to not unfreezing the MIDI data IN pipe before use (thanks to Michael Brown).

Increased endpoint polling interval for all demos and projects to 5ms, as 1ms was causing some enumeration issues on some machines (thanks to Riku Salminen).

Add additional preprocessor sanity checks for the XMEGA platform based on the USB controller input clock speed.

Fixed possible deadlock in the CDC device driver if the USB connection is dropped while the CDC_REQ_SetLineEncoding control request is being processed by the stack (thanks to Jonathan Hudgins).

Fixed incorrect DFU version number reported to the host in the  DFU bootloader descriptors. Fixed incorrect version hundredths value encoding in VERSION_BCD() macro (thanks to Georg Glock).

The library bootloaders will now correctly start the user application after a watchdog-based application start, even if the /HWB line is held low externally during the reset phase.

Changed MIDI event structure MIDI_EventPacket_t to use a single field for the combined virtual cable index and command ID, to prevent bitfield packing issues on some architectures (thanks to Darren Gibbs).

Alter the bootloader section sizes to all be 8KB, to be in line with the default AT90USB1287 fuses, as that is the default target MCU. Add instructions to the documentation to clarify this for the user (thanks to Georg Glock).

Fix up static analysis build test so that inline suppressions for missing header files are not required in the XPLAINBridge project.