fix bug with duplicate library reactions

This sets the rxn.family attribute to the name of the library it was loaded from
rather than the library it was originally from
this prevents reactions in a seed mechanism that were originally from
a reaction library from being duplicated if that reaction library is used
as a reaction library or seed mechanism

rmgpy/data/kinetics/library.py

@@ -245,6 +245,7 @@ def getLibraryReactions(self):
                                       duplicate=entry.item.duplicate, reversible=entry.item.reversible,
                                       allow_pdep_route=entry.item.allow_pdep_route,
                                       elementary_high_p=entry.item.elementary_high_p)
+                rxn.family = self.label #the library the reaction was loaded from (opposed to originally from)
             elif entry._longDesc and 'rate rule' in entry._longDesc: #template reaction
                 c = entry._longDesc.split('\n')
                 family_comments = [i for i in c if 'family: ' in i]