Merge ND-evaluator into master

src/main/java/leon/codegen/runtime/Forall.java

src/main/java/leon/codegen/runtime/Lambda.java

...n/codegen/runtime/LeonCodeGenQuantificationException.java

...leon/codegen/runtime/LeonCodeGenRuntimeHenkinMonitor.java

src/main/java/leon/codegen/runtime/PartialLambda.java

src/main/java/leon/codegen/runtime/Tuple.java

src/main/scala/leon/codegen/CodeGeneration.scala

src/main/scala/leon/codegen/CompilationUnit.scala

src/main/scala/leon/codegen/CompiledExpression.scala

src/main/scala/leon/datagen/VanuatooDataGen.scala

src/main/scala/leon/evaluators/AngelicEvaluator.scala

src/main/scala/leon/evaluators/CodeGenEvaluator.scala

src/main/scala/leon/evaluators/ContextualEvaluator.scala

src/main/scala/leon/evaluators/DefaultEvaluator.scala

src/main/scala/leon/evaluators/DualEvaluator.scala

src/main/scala/leon/evaluators/EvaluationResults.scala

src/main/scala/leon/evaluators/Evaluator.scala

src/main/scala/leon/evaluators/EvaluatorContexts.scala

src/main/scala/leon/evaluators/RecursiveEvaluator.scala

src/main/scala/leon/evaluators/StreamEvaluator.scala