Conflate inputs when possible

src/main/scala/leon/purescala/TreeOps.scala

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

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

src/main/scala/leon/synthesis/rules/CegisLike.scala

src/main/scala/leon/synthesis/rules/Cegless.scala

src/main/scala/leon/synthesis/rules/EquivalentInputs.scala

src/main/scala/leon/synthesis/rules/GuidedDecomp.scala

src/main/scala/leon/synthesis/rules/Tegis.scala

src/main/scala/leon/synthesis/rules/TegisLike.scala

src/main/scala/leon/synthesis/rules/Tegless.scala

src/main/scala/leon/synthesis/utils/ExpressionGrammar.scala