Remove ResultVariable, postcondition are explicitly bound

src/main/scala/leon/SubtypingPhase.scala

src/main/scala/leon/TypeChecking.scala

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

src/main/scala/leon/evaluators/DefaultEvaluator.scala

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

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

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

src/main/scala/leon/purescala/FunctionClosure.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/solvers/z3/FunctionTemplate.scala

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

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

src/main/scala/leon/synthesis/heuristics/ADTInduction.scala

...in/scala/leon/synthesis/heuristics/ADTLongInduction.scala

src/main/scala/leon/synthesis/heuristics/IntInduction.scala

...ain/scala/leon/termination/SimpleTerminationChecker.scala

src/main/scala/leon/verification/DefaultTactic.scala