Re #7950. Set PyQt API version for stand-alone running.

If running in Mantid, this setting is done within the C++ code. I'm adding
it here to make sure things work if running outside of MantidPlot (which
doesn't work at the moment, but could cause confusion later if that's fixed).
Note that this has to be done before the first import of PyQt.

Code/Mantid/scripts/Interface/reduction_application.py

@@ -3,7 +3,6 @@
 """
 import sys, os
 import traceback
-from PyQt4 import QtGui, QtCore, uic
 import math
 
 # Check whether Mantid is available
@@ -15,8 +14,13 @@
     from mantid.api import AlgorithmFactory
     CLUSTER_ENABLED = "SubmitRemoteJob" in AlgorithmFactory.getRegisteredAlgorithms(True)
 except:
+    import sip
+    sip.setapi('QString',2)
+    sip.setapi('QVariant',2)
     pass
 
+from PyQt4 import QtGui, QtCore, uic
+
 REDUCTION_WARNING = False
 WARNING_MESSAGE = ""