licence update plus typos in Makefile
parsing & standardization
new tests added
transport part some updates
diffusion typos and update
thermal conductivity updates
Stockmayer potential
  - should certainly go double[] and double[][] instead of vector,
        so not metaprogramming required
viscosity updates typo and standardizations
addition of
  - cmath header for math_constants (necessary for log)
  - physical quantities (vacuum permeability and permittivity for viscosity)
  - updates on polynomial fit
tests adapted