Note that newer versions of the IDE can still
be made to support compilation for the older boards.

Currently if you clone Marlin to a directory with a space in the name, Arduino will generate an error.
Because when executed the path ends up split into two separate arguments.

This reverts commit 2724baae.

In Travis we already test against 1.17.

- Both TMC, L6470 and pin-driven drivers work.
- All can be mixed and matched as needed.

for ide 1.0.6

these are the files needed to support the Melzi board

- Remove the two version of 16mHz. Crystal and resonator use the same
fuse setting. Also, Arduino IDE only showed the first one 16Mhz as a
board option.

- Added 20Mhz board option.

Symptoms for incorrect fuse setting:
- 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

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