Revert "Clear up final inelastic use of v1 API. Refs #7469"

This reverts commit 125494d.

Turns out it has already been done somewhere else.

Code/Mantid/scripts/Interface/reduction_gui/reduction/inelastic/dgs_utils.py

@@ -1,8 +1,10 @@
 # Forced to use version 1 API.
 IS_IN_MANTIDPLOT = False
 try:
-    import mantid
-    from mantid.simpleapi import *
+    import mantidplot
+    from MantidFramework import *
+    mtd.initialise(False)
+    from mantidsimple import *
     import mantidplot
 
     IS_IN_MANTIDPLOT = True
@@ -26,13 +28,13 @@ def _load_param_file(self, inst_name):
         InstrumentParameters.instrument_name = inst_name
         ws_name = "__emptyInst_" + inst_name
         if IS_IN_MANTIDPLOT:
-            idf_loc = config.getInstrumentDirectory()
+            idf_loc = ConfigService().getInstrumentDirectory()
             idf_pattern = os.path.join(idf_loc, "%s_Definition*.xml") % inst_name
             import glob
             idf_files = glob.glob(idf_pattern)
             output = LoadEmptyInstrument(Filename=idf_files[0], 
                                          OutputWorkspace=ws_name)
-            InstrumentParameters._instrument = output.getInstrument()
+            InstrumentParameters._instrument = output.workspace().getInstrument()
 
     def _self_check(self):
         if self._instrument is None: