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Hybrid Trisolv implementations

jfornera requested to merge trisolv_hybrid into main

There are two openMP implementations, one for the mpi_isend and one for the mpi_onesided. They give some speedup for certain sizes. For Gao's version I couldn't find any speedups with omp. (I left in the omp_set_num_threads() statements, these need to be removed for running on Euler)

I also made some slight adjustments to the mpi_isend and mpi_onesided implementations.

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