* 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

To avoid unused variable warnings

Add runtime test

Add test and expose in Python