WIP: First attempt at a TrMINIPCHI2 functor

Olli Luptonrequested to merge
olupton_trminipchi2_functor into master

Tries to add a TrMINIPCHI2 functor along the same lines as TrMINIP in Rec!1285 (merged).

cc: @sstahl @ibelyaev

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