Support fractional stoichiometric coefficients for reactants

[K20shores]

During #593, the oregonator and e5 analytical tests were converted to pure reactions so that they could be tested on the GPU.

The equations for HIRES were also derived and placed into the comments for that test. However, it requires fractional coefficients on the reactant side which we don't yet support. Support them.

Acceptance criteria

• The HIRES test is build from the set of equations and runs on CPU (Jit and regular), and GPU

Ideas

[K20shores]

Well, that was completely inaccurate. All of the fractional yields are on the right.