Max temperature excursion and fault trigger time are now configurable
via M570
If a heater fault occurs then any SD card print in progress is abandoned
Improved M122 diagnostics headings
Bug fix: some values of pressure advance caused too many extruder steps
to be schedules, resulting in extruder step errors, and another bug in
the error handling then caused layer shifts
Increased max number of probe points to 64 on Duet WiFi and 32 on Duet
0.6/0.8.5
Corrected M37 reporting of simulation time
Added move debug facility
Added recording of more types of move underrun
Use fabsf instead of fabs
M21 doesn't re-mounjt a drive that is aloready mounted and has open
files on it
Added "volumes" variable in extended status report
Report card details after M21 is called
Bug fix: M220 speed changes were nott being implemented as soon as they
should be
Bug fix: lookahead was sometimes failing to join sequences of short
decelerating moves together
Bug fix: at startup the thermistor readings were sometimes very high,
which triggered a bug in strtod() called in PanelDue firmware 1.14 and
earlier
