move idris version to orig and newt version to src.

Development is being done on the newt version now.

src/Data/String.newt

@@ -0,0 +1,9 @@
+module Data.String
+
+import Prelude
+
+unwords : List String → String
+unwords stuff = joinBy " " stuff
+
+instance Cast String Int where
+  cast = stringToInt