qtvcp -probe routines: update qt_auto_probe_tool process

fix the qt_auto_probe_tool ngc prgm; second probe was in wriong direction.
don't move to tool change position if the tool is already in the spindle.
add pin for backoff setting - now follows the adjust setting in versa probe.

Add probe routines to probe material and toolsetter height - related to auto_probe_tool.
roughed out code for direct tool lenth probing but disabled at this time.

Author: c-morley

lib/python/qtvcp/widgets/basic_probe.py

@@ -351,7 +351,10 @@ def get_parms(self):
 
     def show_results(self, line):
         for key in self.status_list:
-            self['status_' + key].setText(line[key])
+            if line[key] != 'None':
+                self['status_' + key].setText(line[key])
+            else:
+                self['status_' + key].setText('')
 
     ##############################
     # required class boiler code #