Refs #12122. Added reduction controlling class.

scripts/HFIR_4Circle_Reduction.py

+#pylint: disable=invalid-name
+from HFIR_4Circle_Reduction import reduce4circleGUI
+from PyQt4 import QtGui
+import sys
+
+def qapp():
+    if QtGui.QApplication.instance():
+        _app = QtGui.QApplication.instance()
+    else:
+        _app = QtGui.QApplication(sys.argv)
+    return _app
+
+app = qapp()
+
+reducer = reduce4circleGUI.MainWindow() #the main ui class in this file is called MainWindow
+reducer.show()
+app.exec_()