Merge ND-evaluator into master

src/main/scala/leon/evaluators/TracingEvaluator.scala

src/main/scala/leon/purescala/ExprOps.scala

src/main/scala/leon/purescala/Expressions.scala

src/main/scala/leon/purescala/Extractors.scala

src/main/scala/leon/purescala/PrettyPrinter.scala

src/main/scala/leon/purescala/Quantification.scala

src/main/scala/leon/solvers/Model.scala

src/main/scala/leon/solvers/QuantificationSolver.scala

...main/scala/leon/solvers/combinators/UnrollingSolver.scala

src/main/scala/leon/solvers/smtlib/SMTLIBCVC4Target.scala

src/main/scala/leon/solvers/smtlib/SMTLIBTarget.scala

src/main/scala/leon/solvers/templates/LambdaManager.scala

.../scala/leon/solvers/templates/QuantificationManager.scala

...main/scala/leon/solvers/templates/TemplateGenerator.scala

src/main/scala/leon/solvers/templates/TemplateInfo.scala

src/main/scala/leon/solvers/templates/Templates.scala

src/main/scala/leon/solvers/z3/AbstractZ3Solver.scala

src/main/scala/leon/solvers/z3/FairZ3Component.scala

src/main/scala/leon/solvers/z3/FairZ3Solver.scala

src/main/scala/leon/utils/PreprocessingPhase.scala