Can do binary mixture tracing now!

Seems to be working

To allow for providing the mole fractions, in order to allow for the use with mixtures.

Doesn't have the claimed critical temperature; closer before fixing the erroneous coefficient

Still can't trace isotherms with mixtures yet

To be sure

Ready for Python!

Using sigma in A seems to be necessary to avoid underflow in some numerical calculations, as is done in PC-SAFT

Seems to be fixed now, not sure what the fix was

Add redirection include

Still need the model and so on, but working

n[21] was -0.99218575e+1 instead of -0.99218575e-1

This is why you should make sure it compiles...

clang on mac doesn't mind

Also test dipolar with JSON

The references seem to be getting broken. There must be an implicit copy somehow.

Added into the coeffs structure, nice interface