- converted from Python2 code to Python3 code

- in camlib.py, CNCJob class -> generate_from_excellon_by_tool() was
failing in the line to sort the tools due of been unable to compare
between dict's. I replaced that section.

GUIElements.py

@@ -81,7 +81,7 @@ class LengthEntry(QtGui.QLineEdit):
     def returnPressed(self, *args, **kwargs):
         val = self.get_value()
         if val is not None:
-            self.set_text(QtCore.QString(str(val)))
+            self.set_text(str(val))
         else:
             log.warning("Could not interpret entry: %s" % self.get_text())
 
@@ -105,7 +105,7 @@ class LengthEntry(QtGui.QLineEdit):
             return None
 
     def set_value(self, val):
-        self.setText(QtCore.QString(str(val)))
+        self.setText(str(val))
 
 
 class FloatEntry(QtGui.QLineEdit):
@@ -115,7 +115,7 @@ class FloatEntry(QtGui.QLineEdit):
     def returnPressed(self, *args, **kwargs):
         val = self.get_value()
         if val is not None:
-            self.set_text(QtCore.QString(str(val)))
+            self.set_text(str(val))
         else:
             log.warning("Could not interpret entry: %s" % self.text())
 
@@ -151,10 +151,10 @@ class IntEntry(QtGui.QLineEdit):
     def set_value(self, val):
 
         if val == self.empty_val and self.allow_empty:
-            self.setText(QtCore.QString(""))
+            self.setText("")
             return
 
-        self.setText(QtCore.QString(str(val)))
+        self.setText(str(val))
 
 
 class FCEntry(QtGui.QLineEdit):
@@ -165,7 +165,7 @@ class FCEntry(QtGui.QLineEdit):
         return str(self.text())
 
     def set_value(self, val):
-        self.setText(QtCore.QString(str(val)))
+        self.setText(str(val))
 
 
 class EvalEntry(QtGui.QLineEdit):
@@ -175,7 +175,7 @@ class EvalEntry(QtGui.QLineEdit):
     def returnPressed(self, *args, **kwargs):
         val = self.get_value()
         if val is not None:
-            self.setText(QtCore.QString(str(val)))
+            self.setText(str(val))
         else:
             log.warning("Could not interpret entry: %s" % self.get_text())
 
@@ -188,12 +188,12 @@ class EvalEntry(QtGui.QLineEdit):
             return None
 
     def set_value(self, val):
-        self.setText(QtCore.QString(str(val)))
+        self.setText(str(val))
 
 
 class FCCheckBox(QtGui.QCheckBox):
     def __init__(self, label='', parent=None):
-        super(FCCheckBox, self).__init__(QtCore.QString(label), parent)
+        super(FCCheckBox, self).__init__(str(label), parent)
 
     def get_value(self):
         return self.isChecked()