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Preventing OOM by memory usage prediction #11

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@sifnoc

Over 70 GB of memory are used to build an aggregation Merkle sum tree with $2^{28}$ entries in summa-aggregation.
This means that a Summa-aggregation process would be terminated without any error message on a machine with only 64 GB of memory.

We need to add some warning for memory usage when initiate create_aggregation_mst method.

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