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Add weights to fit

Emanuele Roberto Nocera requested to merge weights into master

Created by: Zaharid

This adds the possibility of effectively changing the weight of a given dataset in the fit, by appropriately rescaling its systematics (and as a consequence the covariace matrix).

The change is unobtrusive in that it doesn't even add a weight member to DataSet. It is unclear that this is a good thing in all the cases though. The corresponding validphys object does have weights so as to properly define equality.

Still to do:

  • Add handling of weight inputs in nnpdfcpp.
  • Write tests.

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