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Split internal THnSparse classes (that cannot be hidden in the implementation file) into a separate header.
Implement browser interface for THnSparse: will create one entry for each axis; double-clicking that shows the THnSparse's projection onto that axis.


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changes for iOS graphics support.


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 - avoid a clone when merging histograms which have all the same limits


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implement  also correctly TH1::GetEntries in case of buffer histograms


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- improve TH1::Merge to remove a clone of the Histogram which is being merged (this) in case the histogram have all the same limits


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see http://root.cern.ch/phpBB3/viewtopic.php?t=13517


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(see http://root.cern.ch/phpBB3//viewtopic.php?f=3&t=13537 )


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