Add support for the AMPL modeling and script language

samples/AMPL/toy.ampl

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+# A toy knapsack problem from the LocalSolver docs written in AMPL.
+
+set I;
+param Value{I};
+param Weight{I};
+param KnapsackBound;
+var Take{I} binary;
+
+maximize TotalValue: sum{i in I} Take[i] * Value[i];
+s.t. WeightLimit: sum{i in I} Take[i] * Weight[i] <= KnapsackBound;
+
+data;
+
+param:
+I: Weight Value :=
+0    10     1
+1    60    10
+2    30    15
+3    40    40
+4    30    60
+5    20    90
+6    20   100
+7     2    15;
+
+param KnapsackBound := 102;