additional fuse bit settings for using this bootloader:
=======================================================

atmega88/168:

    extended fuse byte:
        1024 words bootloader size: BOOTSZ0 = 0
                                    BOOTSZ1 = 0

        reset vector, jump to bootloader on reset: BOOTRST = 0

    -> default: 0b001 = 0x01
       new:     0b000 = 0x00

    lock byte:
        SPM is not allowed to write to the Boot Loader section BLB12 = 1
                                                               BLB11 = 0

    -> default: 0b111111 = 0x3f
       new:     0b101111 = 0x2f