Fix: Allocate memory for data frame padding #154
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We send data frames in "packets" of 64 bytes (#153) to work around MPI's 32-bit-size limitation. The necessary rounding operation was only applied to the argument to
MPI_Isend, but not the frame allocation. As a result, MPI overran the buffer and sometimes read from unmapped memory.This PR moves the padding computation to the
unique_frame_ptrconstructor through apacket_sizeparameter.