Versioning of base fragments is not necessary anymore, because each Athena release maps exactly to one Sherpa release (i.e. only one include file would have been used anyway).
The NNPDF include file will not include the base fragment anymore, so now JOs should read:
include("Sherpa_i/Base_Fragment.py")
include("Sherpa_i/NNPDF30NNLO.py")
[...]