merge changes from master

cleanups and prepare for   pull request

FlatCAMWorker.py

@@ -1,5 +1,6 @@
 from PyQt4 import QtCore
 
+
 class Worker(QtCore.QObject):
     """
     Implements a queue of tasks to be carried out in order
@@ -46,17 +47,6 @@ class Worker(QtCore.QObject):
 
         self.allow_debug()
 
-        # 'worker_name' property of task allows to target
-        # specific worker.
-        #if 'worker_name' in task and task['worker_name'] == self.name:
-        #    task['fcn'](*task['params'])
-        #    return
-
-        #if 'worker_name' not in task and self.name is None:
-        #    task['fcn'](*task['params'])
-        #    return
-
-
         if ('worker_name' in task and task['worker_name'] == self.name) or \
             ('worker_name' not in task and self.name is None):