NpolPrimaryActionGenerator has been updated to generate neutrons at a point 7 meters in front of the first layer of detectors in the analyers (center of that layer).  NpolDetectors was modified to include a larger world to accommondate.  This generator has angular cuts so as to illuminate only the front arrays area.

Cuts in NpolEventAction have been tweak but still can't get similar dE/E spectra that Andrei has gotten.  Suspect we need another selection criteria.

Minor formating changes to make some files more "readable".