Added independent XS Bias for elastic/inelastic Nuclear scattering
Added XS bias for proton elastic scattering

thru G4FFKEY 20[inelastic]   21[elastic] SX bias (see doc/datacards.doc)
Added independent XS Bias for elastic/inelastic Nuclear scattering
Added XS bias for proton elastic scattering

thru G4FFKEY 20[inelastic]   21[elastic] SX bias (see doc/datacards.doc)
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