With the changes to chemistryModel to evaluate and integrate reaction rates
mass-fraction based rather than mole-fraction based ISAT is now independent of
the thermodynamics and with some restructuring of chemistryModel and the
addition of the non-templated base-class odeChemistryModel is has been possible
to un-template chemistryTabulationMethods and ISAT in particular. This
simplifies the ISAT code and hence maintenance as well as reducing the
compilation time of chemistryModel on the various thermo packages.
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