Stabilize datagen, fix interrupts & parallel, fix array boxing

build.sbt

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

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

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

src/main/scala/leon/datagen/NaiveDataGen.scala

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

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

src/main/scala/leon/frontends/scalac/CodeExtraction.scala

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

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

src/main/scala/leon/purescala/TreeOps.scala

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

src/main/scala/leon/purescala/TypeTreeOps.scala

src/main/scala/leon/purescala/TypeTrees.scala

src/main/scala/leon/solvers/EnumerationSolver.scala

...main/scala/leon/solvers/combinators/PortfolioSolver.scala

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

...in/scala/leon/synthesis/condabd/SynthesizerExamples.scala

...eon/synthesis/condabd/insynth/leon/loader/PreLoader.scala

src/main/scala/leon/verification/AnalysisPhase.scala