Added Three TNI Codes and Examples (#5) * Added TT-OpInf * Added TT-IGA * Added TT-Multimat-Hydro * Minor change to setup_hydro_env.m * Added plotter for TT-Miltimat-Hydro * Fixed comparison plot * Updated TT-Multimat-Hydro-Plot * (*) tt-iga -> IGA * (*) tt-opinf -> OpInf * (*) tt_multimat_hydro -> Multimat --------- Co-authored-by: Oleg Korobkin <korobkin@lanl.gov>