Remove breakpoints, interpolation for non-fission heating
Remove breakpoints, interpolation for non-fission heating

NJOY handles linearization of the cross sections in RECONR:
Section 3.2 NJOY2016 Manual, LA-UR-17-20093

paulromano/openmc,mit-crpg/openmc,liangjg/openmc,paulromano/openmc,walshjon/openmc,amandalund/openmc,amandalund/openmc,smharper/openmc,walshjon/openmc,shikhar413/openmc,liangjg/openmc,mit-crpg/openmc,liangjg/openmc,shikhar413/openmc,liangjg/openmc,smharper/openmc,paulromano/openmc,paulromano/openmc,amandalund/openmc,walshjon/openmc,amandalund/openmc,mit-crpg/openmc,smharper/openmc,mit-crpg/openmc,shikhar413/openmc,smharper/openmc,shikhar413/openmc,walshjon/openmc