Make RDataFrame from TChain where 2 ntuples contains 90% of overlapping branches and do a proper snapshot

If I remember correctly CopyTree will leave the problematic branches unevenly filled. So if those branches are used in subsequent analysis, at best the value use for missing rows will be whatever the last value of the previous file that had the branch and at worst the entries will be misaligned (I think it is the former).

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