Done refactor, next rebuilding rtree-c

rtree/rtree.cabal

rtree/src/Control/Monad/IRTree.hs

rtree/src/Control/RTree.hs

rtree/src/Data/RPath.hs

rtree/test/expected/double-let-expr-red

rtree/test/expected/double-let-expr-red-exp

rtree/test/expected/double-overloading-let-expr-red

rtree/test/expected/double-overloading-let-expr-red-exp

rtree/test/expected/small-let-expr-red

rtree/test/expected/small-let-expr-red-exp

rtree/test/expected/small-opr-expr-red

rtree/test/expected/small-opr-expr-red-exp

rtree/test/src/Control/Monad/IRTreeSpec.hs

rtree/test/src/Control/Monad/RTreeSpec.hs

rtree/test/src/Data/Expr.hs

rtree/test/src/Test/Hspec/GitGolden.hs