Merge branch 'testgen'

demo/Arith.scala

demo/BubbleSortBug.scala

demo/List.scala

demo/ListOperations.scala

demo/MaxSum.scala

demo/RedBlackTree.scala

run-demo

run-demo-testgen

src/main/scala/leon/Annotations.scala

src/main/scala/leon/Evaluator.scala

src/main/scala/leon/Extensions.scala

src/main/scala/leon/FairZ3Solver.scala

src/main/scala/leon/Utils.scala

src/main/scala/leon/plugin/CodeExtraction.scala

src/main/scala/leon/plugin/Extractors.scala

src/main/scala/leon/purescala/Definitions.scala

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

src/main/scala/leon/purescala/ScalaPrinter.scala

src/main/scala/leon/purescala/Trees.scala

src/main/scala/leon/testgen/CallGraph.scala