Added configuration change to keep winder motor on (to be controlled by
an external switch).  Also added a way to enter a extruded length
desired (150,000 mm default) so that when the extruder hits that length
of extruded filament it shuts off.  Length cutoff is added to eeprom
settings saved and ABS configuration settings menu.  Also added elapsed
time and time remaining to get to the length of filament desired.
Changed 4th row of LCD to show both status messages and time info.
Disabled the effect of pushing the momentary contact button on the LCD
(was set up as kill switch causing LCD to freeze).  Added some smoothing
to real time filament diameter reading to avoid spurious max and min
stats.