Merge pull request #166 from MikaelMayer/stringz3

library/lang/string/String.scala

library/lang/string/package.scala

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

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

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

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

src/main/scala/leon/purescala/SelfPrettyPrinter.scala

src/main/scala/leon/solvers/SolverFactory.scala

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

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

src/main/scala/leon/solvers/smtlib/SMTLIBZ3Solver.scala

src/main/scala/leon/solvers/smtlib/SMTLIBZ3Target.scala

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

src/main/scala/leon/solvers/z3/Z3StringConversion.scala

src/main/scala/leon/utils/Library.scala

src/test/scala/leon/integration/solvers/SolversSuite.scala

...st/scala/leon/integration/solvers/StringSolverSuite.scala

.../scala/leon/regression/termination/TerminationSuite.scala

src/test/scala/leon/test/LeonRegressionSuite.scala

testcases/verification/case-studies/LambdaSound.scala