Temporaries were being returned when autodiff was being used, forceeval should fix it I think

Yet another battle with typing

It works!

* Add ability to access a single departure term in a multi-fluid model

* Bump version to dev

* Add methods for calculation of pure fluid critical points

* Pass the template arguments along

* Expose the values and Jacobian

Closes #8

* Add Chebyshev2D departure term type

* Add partial molar volume as a possible output

* And expose to python

* A fully encapsulated library wrapper with C++ interface

* Refactor types.hpp to hide the big headers in a macro conditional section

Covers all the cases, one at a time

Why does Catch not capture the exception?

To check whether you have gotten to the critical point

* Split out reducing and mutants to their own headers

* Remove unused function

For isothermal VLE tracing