Extend functionality of hadd. The new version can store in the result file histograms or Trees that are not found in the first file but are present in any other file.   For example assume 3 files f1, f2, f3 containing histograms hn and Trees Tn     f1 with h1 h2 h3 T1     f2 with h1 h4 T1 T2     f3 with h5    the result of      hadd -f x.root f1.root f2.root f3.root    will be a file x.root with      x with h1 h2 h3 h4 h5 T1 T2    where h1 will be the sum of the 2 histograms in f1 and f2          T1 will be the merge of the Trees in f1 and f2
Extend functionality of hadd. The new version can store in the result file
histograms or Trees that are not found in the first file but are present
in any other file.
  For example assume 3 files f1, f2, f3 containing histograms hn and Trees Tn
    f1 with h1 h2 h3 T1
    f2 with h1 h4 T1 T2
    f3 with h5
   the result of
     hadd -f x.root f1.root f2.root f3.root
   will be a file x.root with
     x with h1 h2 h3 h4 h5 T1 T2
   where h1 will be the sum of the 2 histograms in f1 and f2
         T1 will be the merge of the Trees in f1 and f2


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@13169 27541ba8-7e3a-0410-8455-c3a389f83636

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