From Lorenzo: merge changes of Kyle in histfactory schema from roostats development branch (revision 41704).
From Lorenzo:
merge changes of Kyle in histfactory schema from roostats development
branch (revision 41704).


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@41721 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT