Reworked I/O implementation #58
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With this PR we will no longer call GetEntry on trees. Instead, each object holds the branches it uses, and call branch->GetEntry. This enables more flexibility in I/O prioritization and the relation between object I/O calls more transparent.
We finally also fully support TChain reading #27. Interfaces are transparent to what the input object is. Branch and object address updates are managed through the Notify() mechanism.