becaue it is over-restrictive and superseeded by the now working tests
if the probe-recktangle can be reached. See iss#2366

Sign flipped with #2167.
See also comments
https://github.com/MarlinFirmware/Marlin/issues/2040#issuecomment-118568355
and following.

- Also fix a bug in `M600` where `Z_MAX_ENDSTOP_INVERTING` is being
used as the index into the `destination[AxisEnum]` array.

here the other two occurences of `Z_PROBE_OFFSET_FROM_EXTRUDER` are
replaced with `zprobe_zoffset`.

verified via 1.0.2 tag that compiles by multiple people,
credit for the fix goes to paulusjacobus for the initial find and
sniffle for the correction so M851 works.

n_samples is an uint8_t .
Got printouts like:
50 of 2  ...

Gleaned from
https://github.com/MarlinFirmware/Marlin/commit/4ac14a7e5f
8976eafd1a

at least the lcd independent part from Marlin_main.cpp.

to MELZI_MAKR3D.

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

ZigZag has been disabled by fault due to do_topography_map

Also clean up some trailing spaces in a few other sources