refs #8643. Inserting the polarisation correction routines.

Appears to be working for PNR and PA cases. System test for multi detector runs is failing as a result of these changes. This will need fixing.

Code/Mantid/scripts/Reflectometry/isis_reflectometry/convert_to_wavelength.py

@@ -16,6 +16,14 @@ def sum_workspaces(cls, workspaces):
         """
         return sum(workspaces)
 
+    @classmethod
+    def to_single_workspace(cls, candidate):
+        ws = ConvertToWavelength.to_workspace(candidate)
+        if isinstance(ws, mantid.api.WorkspaceGroup):
+            return ws[0]
+        else:
+            return ws
+
     @classmethod
     def to_workspace(cls, candidate):
         workspace = None

Code/Mantid/scripts/Reflectometry/isis_reflectometry/l2q.py

@@ -3,7 +3,7 @@
 from mantid.simpleapi import *  # New API
 from mantid.geometry import ReferenceFrame
 
-def l2q(ws,whichDet,theta):
+def l2q(ws,whichDet,theta, sample_component_name):
     '''    
     call signature::call signature::
 
@@ -15,6 +15,7 @@ def l2q(ws,whichDet,theta):
       ws : run to be converted into Q.
       whichDet : Name of the component detector
       theta : final theta angle to use.
+      sample_component_name: Name of the component that corresponds to the sample
 
     TODO:
         1) This is currently a point detector only function. This will either need 
@@ -30,7 +31,7 @@ def l2q(ws,whichDet,theta):
     else:
         inst = ws.getInstrument()
 
-    sampleLocation=inst.getComponentByName('some-surface-holder').getPos()
+    sampleLocation=inst.getComponentByName(sample_component_name).getPos()
     detLocation=inst.getComponentByName(whichDet).getPos()
     sample2detector=detLocation-sampleLocation    # meters