Added new board to Arduino IDE

Added a new board "Arduino Auto" to the list of boards just to see if
it works. It did!
Merge remote-tracking branch 'origin/allegro' into allegro
Fixed re-sync setting of USART to disabled.

Added setting up of LINBTR register to disable re-sync and setting
sample to 8-bits.
Fixed fuse settings for ATmega32c1 for ISP.

Fuse settings changed to match those of the AT6844-DK MCUs settings.
Updated board list to rename auto to 'Allegro'; fixed fuse settings.

Fuse settings now match Makefile for Optiboot.
Board name changed to 'Allegro'.