Add python t0 covmat
Created by: wilsonmr
As discussed I'm adding one of the other ingredients for using the python commondata in fit. I've also added some actions so the new functions can be called from the API.
I thought I was being clever adding load_commondata
to the CommonDataSpec
class but it ended up making circular dependencies - I think a better option would have a provider which calls the funciton on a CommonDataSpec
. Whilst I'm at it I will make a second provider which applies cuts.