Delete rewriting solver

src/main/scala/inox/solvers/combinators/RewritingSolver.scala

-/* Copyright 2009-2016 EPFL, Lausanne */
-
-package leon
-package solvers
-package combinators
-
-import purescala.Expressions._
-
-abstract class RewritingSolver[+S <: Solver, T](underlying: S) {
-  val context = underlying.context
-
-  /** The type T is used to encode any meta information useful, for instance, to reconstruct
-    * models. */
-  def rewriteCnstr(expression: Expr) : (Expr,T)
-
-  def reconstructModel(model: Model, meta: T) : Model
-
-  private var storedMeta : List[T] = Nil
-
-  def assertCnstr(expression: Expr) {
-    val (rewritten, meta) = rewriteCnstr(expression)
-    storedMeta = meta :: storedMeta
-    underlying.assertCnstr(rewritten)
-  }
-
-  def getModel: Model = {
-    storedMeta match {
-      case Nil    => underlying.getModel
-      case m :: _ => reconstructModel(underlying.getModel, m)
-    }
-  }
-}