finish splitting modules, and start using ninja

sexpr.mli

@@ -0,0 +1,25 @@
+type t =
+  Nil
+| Int  of int
+| Flt  of float
+| Cons of t * t
+| Id   of string
+| Str  of string
+
+val li1 : t -> t
+
+exception Not_SExpr_List
+
+val is_list  : t -> bool
+val append   : t -> t -> t
+val rem_nil  : t -> t
+val flat_map : (t->t) -> t -> t
+val aggr_flat_map : ('a -> t -> t * 'a) -> 'a -> t -> t * 'a
+
+val pp_t : Format.formatter -> t -> unit
+
+val parse_inline     : unit -> t Pc.parsr
+val parse_inline_end : unit -> t Pc.parsr
+val parse_top        : unit -> t Pc.parsr
+
+val parser_tests : string list