Something is wrong with the parsing of docs, not clear what

Possibly they are entirely working, but they are hard to debug because doing the numerical derivatives correctly is very tricky, especially shifting the mole fractions while keeping molar density constant. A new method might be needed for testing use only.

At one million indexes per second, half a million years to run out of indices

closes #33

Replace missing headers as needed

See #16

Refactor abstract model (and so much more)

Helpful for debugging clang problems

Fixes the compilation problems, I hope

This is weird..

Fixes a lot of compiler warnings

Had cast to wrong type