fixes for SystematicsCache in 21.2
For 21.2 the return type of applySystematicVariation() needs to be
different. And the hash object for SystematicSet needs to have a
const
operator.
cc @mmuskinj
For 21.2 the return type of applySystematicVariation() needs to be
different. And the hash object for SystematicSet needs to have a
const
operator.
cc @mmuskinj