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

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Co-authored-by: Oleg Korobkin <korobkin@lanl.gov>