generalized optimization to modify different species and thermo properties

tests/one_ree_settings.txt

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+{"exp_csv_filename": "../data/csvs/exp_data.csv", "phases_xml_filename": "../data/xmls/twophase.xml", "opt_dict": {"Nd(H(A)2)3(org)": {"h0": -4662344.6400}}, "phase_names": ["HCl_electrolyte", "PC88A_liquid"], "aq_solvent_name": "H2O(L)", "extractant_name": "(HA)2(org)", "diluant_name": "dodecane", "complex_name": "Nd(H(A)2)3(org)", "rare_earth_ion_name": "Nd+++", "aq_solvent_rho": 1000.0, "extractant_rho": 960.0, "diluant_rho": 750.0}