HIGGSPOS

Created by: scarrazza

@enocera, @Zaharid as far as I can tell, the HIGGSPOS dataset was created manually and copy/pasted into the old repo, here:

https://github.com/NNPDF/nnpdfcpp/blob/ada9bc544763d5eac97956dfcf1a57a2b7110784/data/commondata/DATA_HIGGSPOS.dat

So, I think we remove this dataset from this repository.