Changed property name values and Name of file

The algorithm being subscribed to mantid is called GetNuMegMuonicXRD so the file name has been changed for continuity. To comply with RHEL builds the property names now have no spaces.
Refs #13145

Code/Mantid/Framework/PythonInterface/plugins/algorithms/MuonicXRD.py → Code/Mantid/Framework/PythonInterface/plugins/algorithms/GetNuMegMuonicXRD.py

@@ -18,12 +18,12 @@ class GetNegMuMuonicXRD(PythonAlgorithm):
 
     def PyInit(self):
         element_type = self.Muonic_XR.keys()
-        self.declareProperty("Element List", "None", StringListValidator(element_type),
+        self.declareProperty("ElementList", "None", StringListValidator(element_type),
                              doc="List of available elements")
         self.declareProperty(StringArrayProperty("Elements", values=[],
                              direction=Direction.Input
                              ))
-        self.declareProperty(name="YAxis Position",
+        self.declareProperty(name="YAxisPosition",
                                     defaultValue=-0.001,
                                     doc="Position for Markers on the y-axis")
 
@@ -47,7 +47,7 @@ class GetNegMuMuonicXRD(PythonAlgorithm):
 
     def PyExec(self):
         elements = self.getProperty("Elements").value
-        yposition = self.getProperty("YAxis Position").value
+        yposition = self.getProperty("YAxisPosition").value
         workspace_list = [None]*len(elements)
         for idx,element in enumerate(elements):
             curr_workspace = self.Create_MuonicXR_WS(element, yposition)