Allow to override the amount of extruders from the commandline.
Fix bug where endstop error was detected for X/Y but reported for Z.
Remove the jittering effect when the print is finished and the printer is cooling down and has a temperature around the "save" point.
Add some more checks in the time estimate code. Hopefully fixing some problems with it.
Also shown an error when no file is opened anymore during printing.
Add UPET