MPI1/AMR validation fix - #679
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It was redundant because the interpolation check ``!(iter % period)`` correctly evaluates to ``true`` on the 0th iteration anyway. More importantly, this is fixing the **validation error** that was happening otherwise.
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Fixes #678
On top of fixing MPI1/AMR result validation error, I initialized
recv_bufandsend_buftoNULLas passing uninitialized buffer pointers toMPI_Alltoallvcan potentially lead to segmentation fault.