Tutorial: How to read and update the smoothieboard config file

[tamarum]

Explain what parameters need to be set and which variables represent which motors.

[ddigor]

LHR_Smoothie.xlsx
Collated some motor stuff into tiny spreadsheet.

Endstops seem to have dedicated pins
alpha - config file lines 197, 198
beta - config file lines 202, 203
gamma - config file lines 207, 208
and dedicated enabling as limits
config file lines 218, 219, 220
Unclear how to deal with switches on the two motor Y axis
wire OR will work for an emergency stop, but not good for re-homing after a tooth slip
Unclear how to do use limit inputs for more than 3 axes,
like for the pipette plunger A and B axes