Refactor refactor into repair, since it does repair

src/main/scala/leon/LeonOption.scala

src/main/scala/leon/Main.scala

src/main/scala/leon/Settings.scala

src/main/scala/leon/repair/RepairCostModel.scala

src/main/scala/leon/repair/RepairPhase.scala

src/main/scala/leon/repair/Repairman.scala

src/main/scala/leon/utils/DebugSections.scala