Feature PINN (#161)

* Added MLP filename for data-driven fluid model

* Added restart file for regression test case

* new solution for data-driven fluid test case obtained with recent changes to RANS solver

Author: EvertBunschoten

nicf/datadriven/MLP_nitrogen.mlp

@@ -0,0 +1,78 @@
+<header>
+
+[number of layers]
+4
+
+[neurons per layer]
+2
+12
+12
+1
+
+[activation function]
+linear
+exponential
+exponential
+linear
+
+[input names]
+Density
+Energy
+
+[input regularization method]
+minmax
+
+[input normalization]
++2.1090497188197315e-02	+1.3149764159282715e+03
+-8.7440483449298932e+04	+1.9651855451196916e+06
+
+[output names]
+s
+
+[output regularization method]
+minmax
+
+[output normalization]
++2.7967895102447687e+03	+9.7307708439237176e+03
+
+</header>
+
+[weights per layer]
+<layer>
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+</layer>
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+</layer>
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+</layer>
+
+[biases per layer]
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