Added one more StringSolver benchmark and re-enabled the equation propagation phase after correcting the bug.

- Wrong extraction of multiple directly nested inner functions.
- Wrong printing of LetDefs
- Corrected grammar benchmark (dangling case)

Added question acceptance.

Corrected benchmark

BUG FIX: Reconstructing of passes was reversed.

Corrected String render.

Better evaluator.

Conflicts:
	build.sbt
	src/main/scala/leon/datagen/VanuatooDataGen.scala
	src/main/scala/leon/evaluators/AngelicEvaluator.scala
	src/main/scala/leon/evaluators/CodeGenEvaluator.scala
	src/main/scala/leon/evaluators/ContextualEvaluator.scala
	src/main/scala/leon/evaluators/DefaultEvaluator.scala
	src/main/scala/leon/evaluators/DualEvaluator.scala
	src/main/scala/leon/evaluators/Evaluator.scala
	src/main/scala/leon/evaluators/EvaluatorContexts.scala
	src/main/scala/leon/evaluators/RecursiveEvaluator.scala
	src/main/scala/leon/evaluators/StreamEvaluator.scala
	src/main/scala/leon/evaluators/TracingEvaluator.scala
	src/main/scala/leon/purescala/ExprOps.scala
	src/main/scala/leon/repair/RepairNDEvaluator.scala
	src/main/scala/leon/repair/RepairTrackingEvaluator.scala
	src/main/scala/leon/repair/rules/Focus.scala
	src/main/scala/leon/solvers/z3/AbstractZ3Solver.scala
	src/main/scala/leon/utils/StreamUtils.scala
	src/test/scala/leon/integration/solvers/SolversSuite.scala

for displaying counter-examples for the Verification.

Corrected pretty printing of "\n"

Added variable name for the case class when considering dependent types - There can be two options of the same type now as fields of the case class.
Now work for Jad's example.
Corrected bug when using Z3
Corrected bug when using infinite stream not lazily.