- fixed a bug in Excellon Editor that crashed the app when editing the first tool added automatically into a new black Excellon file

- made sure that if the big mouse cursor is selected, the utility geometry in Excellon Editor has a thicker line width (2 pixels now) so it is visible over the geometry of the mouse cursor

FlatCAMPool.py

@@ -1,5 +1,5 @@
 from PyQt5 import QtCore
-from multiprocessing import Pool
+from multiprocessing import Pool, cpu_count
 import dill
 
 
@@ -23,7 +23,7 @@ class WorkerPool(QtCore.QObject):
 
     def __init__(self):
         super(WorkerPool, self).__init__()
-        self.pool = Pool(2)
+        self.pool = Pool(cpu_count())
 
     def add_task(self, task):
         print("adding task", task)