See https://github.com/usnistgov/teqp/issues/9

Should speed up compilation a smidge

A polish was needed after perturbation (duh!)

Just need to fill in the remaining terms and test, test, test

Also quiet the shell output

Fix bug in temperature ones

And to python interface

It works!

* Add methods for calculation of pure fluid critical points

* Pass the template arguments along

* Expose the values and Jacobian

* Add Chebyshev2D departure term type

* Add partial molar volume as a possible output

* And expose to python