Avoid clobbering of ROOT dictionaries.
Merge pull request #55 from adavidzh/linkdef_fix

Avoid clobbering of ROOT dictionaries.
Update new Pdf for HWW analysis
Update new Pdf for HWW analysis
Update new Pdf for HWW analysis
Merge pull request #57 from rgerosa/master

Implementation of new Pdfs for HWW-related EXO analysis