Support up to 6 axes in many commands
Allow creation of additional axes in M584
Display delta paremners to 3dp instead of 2dp
Removed M126/M127 error messages
Delta calibration now supports bed tilt parameters
On Duet WiFi, delta calibration is now done in double precision maths
Added support for G4 S parameter
Bed compensation or delta calibration is now aborted if the probe was
triggered at the start or was not triggered by the end of the probing
move
Bug fix: JSON file list returned by M20 S2 is now terminated by \n
Bug fix: stupidly high temperatures were returned immediately after
power up in response to status requests
Bug fix: when using an analog Z probe, probing movements were sometimes
aborted before the full depth had been probed but the firmware thought
that probing had terminated at the full depth
Bug fix: generic messages were sent to PanelDue in plain text format
