Iterative MPI solver based on CERFACS library
https://www.cerfacs.fr/algor/Softs/GMRES/
V. Fraysse, L. Giraud, S. Gratton, and J. Langou, A set of GMRES routines for real and complex arithmetics on high performance computers, CERFACS Technical Report TR/PA/03/3, public domain software available on www.cerfacs/algor/Softs, 2003