Making sure MGC cleans up copies of events

We were missing the removal of a temporary copy of the LHE file, which
can be quite large under certain circumstances.

Generators/MadGraphControl/python/MadGraphUtils.py

@@ -1500,6 +1500,8 @@ def arrange_output(process_dir=MADGRAPH_GRIDPACK_LOCATION,lhe_version=None,saveP
             shutil.copyfileobj(mod_output2, final_file)
             final_file.close()
             shutil.copy(os.getcwd()+'/events.lhe.copy',os.getcwd()+'/events.lhe')
+            # Clean up after ourselves
+            os.remove(os.getcwd()+'/events.lhe.copy')
         mod_output2.close()
 
     # Actually move over the dataset