- made isolation threaded

FlatCAMApp.py

@@ -3537,7 +3537,7 @@ class App(QtCore.QObject):
         # Check units and convert if necessary
         # This condition CAN be true because initialize() can change obj.units
         if self.options["units"].upper() != obj.units.upper():
-            self.inform.emit('[ERROR_NOTCL] %s: %s' %
+            self.inform.emit('%s: %s' %
                              (_("Converting units to "), self.options["units"]))
             obj.convert_units(self.options["units"])
             t3 = time.time()