Match ATmega8 fuses to the other chips

[carlosefr]

To match the configuration of other chips (activating brown-out detection and not saving EEPROM on chip erase), the ATmega8 fuses should probably be changed to these:

atmega8.menu.clock.internal1=1 MHz (internal)
atmega8.menu.clock.internal1.bootloader.low_fuses=0xa1
atmega8.menu.clock.internal1.bootloader.high_fuses=0xcc
atmega8.menu.clock.internal1.build.f_cpu=1000000L

atmega8.menu.clock.internal8=8 MHz (internal)
atmega8.menu.clock.internal8.bootloader.low_fuses=0xa4
atmega8.menu.clock.internal8.bootloader.high_fuses=0xcc
atmega8.menu.clock.internal8.build.f_cpu=8000000L

atmega8.menu.clock.external16=16 MHz (external)
atmega8.menu.clock.external16.bootloader.low_fuses=0xbf
atmega8.menu.clock.external16.bootloader.high_fuses=0xcc
atmega8.menu.clock.external16.build.f_cpu=16000000L

Testing requires access to an ATmega8 chip, which I don't have available right now.

Ref: http://www.engbedded.com/fusecalc/