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.

Rename build system module makefiles from "lufa.MODULE.in" to "lufa_MODULE.mk" to prevent makefile from assuming the include is an old style build rule, slowing down the build process.

Prevent the BUILD module from shell-executing multiple processes to determine the avr-size flags to speed up the build, unless the size rule is invoked.

Add warnings and set warnings as errors to the SingleUSBModeTest build test makefile.

Rename hid-teensy and hid-teensy-ee targets to teensy and teensy-ee to be in line with the DFU module target names.

Update BUILD build system module with OBJECT_FILES variable, for additional user-specified object files. Update HID build module with a small shim application to reprogram the EEPROM of a target.

Add OBJDIR optional build variable to the BULD build system module, to allow the user project to relocate the output object and dependency files to a different directory.

Add Build System documentation to the library manual. Update CPPCHECK build system module so that it uses the SRC variable rather than just the project directory.