sst: Re-implement SMPI_ interfaces as C wrappers of Comm encapsulation
Created by: bradking
adios2::helper::Comm
encapsulates ADIOS multi-process communication, but it is a C++ interface and SST is implemented in C. Create a C wrapper to use the Comm encapsulation from SST. This will enable the SST engine to be used by both serial and parallel applications from a single build.