1) Jixie added Oscar's scaling fit with subroutine SCALINGFIT in epc_or.f
   Only has the pi0 scaling fit.
2) Modified epc_or.f so that variable epc_xn in a common block shared
   with gen_evt.f is filled with epc cross section.
3) modified gen_evt.f to use epc_xn instead of pionwiser for the
   epc cross section
4) added variable xsnscal to the output ntuple. xsnscal is the cross
   section from Oscar's fit and the variable xsn is the original epc
   cross section.