Changed 1284p fuse setting for 8, 16 and 20 Mhz

Symtopns:

- X axis move in one direction
- limit switches fail to trigger
- unable to reprogram the device via bootloader
- stops working when the reset switch is pressed.
- device fails to bootup when power by a slow raise power supply.

Solution:
- Disabled the jtag
- set the correct clock selection bit
- set the correct bootloader memory size
- enable brown-out setting
- enable clock power up delay

ArduinoAddons/Arduino_0.xx/Sanguino/boards.txt

 atmega12848m.upload.maximum_size=131072
 atmega12848m.upload.speed=19200
 
-atmega12848m.bootloader.low_fuses=0xFD
-atmega12848m.bootloader.high_fuses=0x9A
-atmega12848m.bootloader.extended_fuses=0xFF
+atmega12848m.bootloader.low_fuses=0xD6
+atmega12848m.bootloader.high_fuses=0xDA
+atmega12848m.bootloader.extended_fuses=0xFD
 atmega12848m.bootloader.path=atmega
 atmega12848m.bootloader.file=ATmegaBOOT_168_atmega1284p_8m.hex
 atmega12848m.bootloader.unlock_bits=0x3F
 atmega1284.upload.maximum_size=131072
 atmega1284.upload.speed=57600
 
-atmega1284.bootloader.low_fuses=0xFF
-atmega1284.bootloader.high_fuses=0x9A
-atmega1284.bootloader.extended_fuses=0xFF
+atmega1284.bootloader.low_fuses=0xD6
+atmega1284.bootloader.high_fuses=0xDA
+atmega1284.bootloader.extended_fuses=0xFD
 atmega1284.bootloader.path=atmega
 atmega1284.bootloader.file=ATmegaBOOT_168_atmega1284p.hex
 atmega1284.bootloader.unlock_bits=0x3F
 atmega1284s.upload.maximum_size=131072
 atmega1284s.upload.speed=57600
 
-atmega1284s.bootloader.low_fuses=0xFF
-atmega1284s.bootloader.high_fuses=0x9A
-atmega1284s.bootloader.extended_fuses=0xFF
+atmega1284s.bootloader.low_fuses=0xD6
+atmega1284s.bootloader.high_fuses=0xDA
+atmega1284s.bootloader.extended_fuses=0xFD
 atmega1284s.bootloader.path=atmega
 atmega1284s.bootloader.file=ATmegaBOOT_168_atmega1284p.hex
 atmega1284s.bootloader.unlock_bits=0x3F