70 fix absolute paths to load unifac parameters

[SalvadorBrandolin]

Nueva clase para representar los parametros de los modelos "tipo UNIFAC"

funcion para instanciar esta clase con los parametros de UNIFAC

Los parametros de UNIFAC quedan definidos en un source code (medio feo pero es lo que hay)

esto hace que UNIFAC ya no esté bugueado

Nueva clase he instancia de UNIFAC testead

Nueva clase aplicada con exito en la funcion setup_unifac

los .npy no existen mas

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.12281% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.50%. Comparing base (1600bb8) to head (ec699af).

Files	Patch %	Lines
...cess_gibbs/group_contribution/model_parameters.f90	98.18%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #79 +/- ## ========================================== + Coverage 92.93% 93.50% +0.56% ========================================== Files 50 53 +3 Lines 2335 2416 +81 Branches 183 180 -3 ========================================== + Hits 2170 2259 +89 + Misses 116 111 -5 + Partials 49 46 -3 ```

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[fedebenelli]

petacular!