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make changes requested by reviewers

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add M43 test to Travis, fix EOL, remove trailing spaces

In the endstop testing section, add the "reverse" logic in addition to "normal" core handling.

In CoreXY/YZ/XZ steppers rotating the same direction gives X movement. Opposing directions produces Y movement.

In CoreYX/ZY/ZX this is reversed. Same = Y, Opposite = X.

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Fixes the issue where the Y endstop was being checked when moving in the X direction, etc.