Modidy hadd to use the slow merging method in case the Target and Source files have different compression levels.
Modidy hadd to use the slow merging method in case the Target and Source files
have different compression levels.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@14708 27541ba8-7e3a-0410-8455-c3a389f83636

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