-AVR8 cpu changes [Felipe Sanches]
 - timers wip
 - Add TIMSK* reads - Refactor timer_tick calls
 - Remove all redundant register init statements. 
   We simply set all 0x200 registers to zero.
 - debugging timers
 - better syntax for disassembly of RJMP destination address
 - use register names in disasm of CBI, SBI, SBIC, SBIS instructions
 - use register bit names in disasm of instructions SBI,
    SBIS, SBIC, CBI 
 - wip on avr8 EEPROM read/write support