- use stored values of min and max for BrentAlgorithms when xmin >=xmax  (fix bug https://savannah.cern.ch/bugs/index.php?42588)
- use stored values of min and max for BrentAlgorithms when xmin >=xmax 
(fix bug https://savannah.cern.ch/bugs/index.php?42588)


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@25728 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root