merge from development branch histfactory tutorial  (up to revision 39932)
merge from development branch histfactory tutorial  (up to revision 39932)

- new tutorial from Kyle (ModifyInterpolation.C)


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@39933 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root