Shortcut to get to the PDFs objects for the specific analysis that is being run.

[chiarabellenghi]

It would be super helpful for developing new analyses to have a shortcut function implemented in the create_analysis method that allows the user to get the PDF (or PDFSet) used for that specific likelihood implementation.

[martwo]

A general shortcut is very difficult to implement, because the structure of the LH function depends on the particular analysis. So I would leave this to the end-user. However, for a particular analysis, an utility function could be made within the analysis.py file which retrieves the desired PDF / PDFSet instance of that particular analysis.