Refactored BP format

Podhorszki, Norbertrequested to merge
github/fork/williamfgc/bpbase_refactor into master

Created by: williamfgc

Introduced class BPBase Handling common parameters StatsLevel defaul is 1 in BP3 Refactored IOChrono to a class with member functions Adapted BP3, BP4, SST, and InSituMPI engines Tests working

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