Apply BSD 2 clauses license

src/main/scala/leon/solvers/z3/UninterpretedZ3Solver.scala

src/main/scala/leon/solvers/z3/Z3ModelReconstruction.scala

src/main/scala/leon/synthesis/Algebra.scala

src/main/scala/leon/synthesis/ChooseInfo.scala

src/main/scala/leon/synthesis/CostModel.scala

src/main/scala/leon/synthesis/FileInterface.scala

src/main/scala/leon/synthesis/Heuristics.scala

src/main/scala/leon/synthesis/LinearEquations.scala

src/main/scala/leon/synthesis/Main.scala

src/main/scala/leon/synthesis/ManualSearch.scala

src/main/scala/leon/synthesis/ParallelSearch.scala

src/main/scala/leon/synthesis/Problem.scala

src/main/scala/leon/synthesis/Rules.scala

src/main/scala/leon/synthesis/SimpleSearch.scala

src/main/scala/leon/synthesis/Solution.scala

src/main/scala/leon/synthesis/SynthesisContext.scala

src/main/scala/leon/synthesis/SynthesisOptions.scala

src/main/scala/leon/synthesis/SynthesisPhase.scala

src/main/scala/leon/synthesis/Synthesizer.scala

src/main/scala/leon/synthesis/Task.scala