- Makefile (atusb.elf): generate a new version iff generating a new
executable
- Makefile (atusb.bin): print the build number and the file size
- Makefile (clean): remove the various constituend files of the version
- Makefile (version.c): generate version.c
- version.h: definitions for the generated version.c
- ep0.c (build_number, build_date): removed dummy version information
and include version.h instead