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Revision to Using mesh bed compensation

Tony

If the heightmap.csv file contains a column of zeros at the start or the end, this indicates that the corresponding X coordinate was not reachable by the probe, taking account of the bed size specified in the M665 command on a delta printer or the M208 commands for other printers, and the probe offset specified by the X and Y parameters in the G31 command. Similarly, if there is a row of zeros then the corresponding Y coordinate was not reachable.
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+If you are manually editing heightmap.csv note that the firmware uses 0.0 to mean zero height error and 0 to mean that the point was not probed so the height error needs to be extrapolated.

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