Some corrections and new features

Master

ramps do have power for the servos, the power comes from the power connector, not sure why this note was even made

ok

For cartesian bots, the X_AXIS is the real X movement and same for
Y_AXIS.
But for corexy bots, that is not true. The "X_AXIS" and "Y_AXIS" motors
(that should be named to A_AXIS
and B_AXIS) cannot be used for X and Y length, because A=X+Y and B=X-Y.
So we need to create other 2 "AXIS", named X_HEAD and Y_HEAD, meaning
the real displacement of the Head.
Having the real displacement of the head, we can calculate the total
movement length and apply the desired speed.

There is the possibility of turn on this features adding "#define SLOW_PWM_HEATERS" in Configuration.h

Re-enable filament menu with recalc fix when enabling/disabling mm3

replaced ASCII GPL v3 license by markdown version

moved new COPYING file to top-level directory to make it more visible and remove clutter from Marlin subduer

Cleanup and refactoring of termistor LUT generator (fixes bug #1305)

This reverts commit dd7e4ee97f.

This reverts commit 2b9722f387.

issue 968 for dev branch

try, try again.

If 'OK' is garbled on sending PC won't receive it.  Both machines will
wait on each other forever.  This resends OK if nothing is heard from PC
for a while to avoid this bad case.

temp runaway: proper cast to prevent any overflow.

Define analogInputToDigitalPin only if needed

Added further tests to Travis CI config

Fix for cant compile when REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER ...