to MELZI_MAKR3D.

Fix for #2288
As the normal MELZI also can have a 1284.

- Add 3 new lines to `pins.h` to remove 2 redundant tests in
`pins_RAMPS_13.h`

No way to fit Marlin into 32K.

Copied from jcrocholl's contributions to the OpenBeamUSA Marlin fork

Created a new board to make using RAMPS as a CNC machine controller
easier. It maps pin 8 to the spindle and pin 9 to the controller fan.

is not used.

be.
Added Sanity Check for it.
Added hook so it's enabled.

Typo fixes in comments in existing code.

- Patched up for most included configurations

Z_DUAL_ENDSTOPS is a feature to enable the use of 2 endstops for both Z
steppers - Let's call them Z stepper and Z2 stepper.
That way the machine is capable to align the bed during home, since both
Z steppers are homed.
There is also an implementation of M666 (software endstops adjustment)
to this feature.
After Z homing, this adjustment is applied to just one of the steppers
in order to align the bed.
One just need to home the Z axis and measure the distance difference
between both Z axis and apply the math: Z adjust = Z - Z2.
If the Z stepper axis is closer to the bed, the measure Z > Z2 (yes, it
is.. think about it) and the Z adjust would be positive.
Play a little bit with small adjustments (0.5mm) and check the
behaviour.
The M119 (endstops report) will start reporting the Z2 Endstop as well.

- Add BIT and TEST macros
- Add _APPLY_ macros to stepper.cpp to help with consolidation
- Consolidate code in stepper.cpp using macros
- Apply standards in stepper.cpp
- Use >= 0 instead of > -1 as a better semantic
- Replace DUAL_Y_CARRIAGE with Y_DUAL_STEPPER_DRIVERS

- Also apply cleanup for #1514

Also fix analogInputToDigitalPin so it uses proper C hex notation

#1405 includes some changes to pins.h for a 4th extruder. This commit
applies those changes. It also deals with a possible problem with
SENSITIVE_PINS.

Hopefully this is helpful to organization and future expansion….

Also fix analogInputToDigitalPin so it uses proper C hex notation

Hopefully this is helpful to organization and future expansion….

#1405 includes some changes to pins.h for a 4th extruder. This commit
applies those changes. It also deals with a possible problem with
SENSITIVE_PINS.

Hopefully this is helpful to organization and future expansion….

Pins 2 and 3 are probably general-use pins, since the filament sensor
uses pin 2.

Changes to temperature.cpp from Ultimaker fork, intended to address
#1226 and #1227

Changes to temperature.cpp from Ultimaker fork, intended to address
#1226 and #1227

## Add: Board for Vellemann K8200 (derived from 3Drag)

* Boards.h: updated comment for board 3Drag - K8200 removed
* Boards.h: added `BOARD_K8200` with ID 78

* language.h.: machine name and firmware URL for new board

* pins.h: added `K8200` to any `#if` with `3Drag` and corresponding
comments

When a melzi board and a full gfx are both selected, the build fails
blaming for some missing defines.

This is a fix for the issue: now my configuration works.