Revert "Use a fork of optiboot git"
Revert "Use a fork of optiboot git"

This reverts commit c8a4d62a9d7c225bdc0add08511e7e940d2151d5.

AtmelUniversityFrance/atmel-avr-xmini-boardmanagermodule,AtmelUniversityFrance/atmel-avr-xmini-boardmanagermodule