Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1
Add M401 - Wait for user on LCD button press
Do not initialize in the header file.
Update after testing
Last M401 update, refresh the LCD during an M401 wait.
Add strigification for extruder amount in M115 report.
Extended range above 250C. (Operating range states up to 300C)
Tested May 19 - It works! Verified with separate thermocouple TM-902C also.
Update Marlin/Configuration.h
Update Marlin/thermistortables.h
Update Marlin/thermistortables.h
Added top ratings and extended to ADC=1 for table 3 and 5.
Update Marlin/thermistortables.h
Update Marlin/thermistortables.h
Changed M401 to M0/M1 as suggested, so they match normal CNC stop commands.
Small correction.
Update Marlin/thermistortables.h
Update Marlin/Configuration.h
Fixed E1_ENABLE pin for Ultimaker. This was wrong for the 1.5.4 and 1.5.3 PCB (I cannot check the 1.5.6)
Fixed SL bug.