move ice-9/ and oop/ under module/

Moved ice-9/ and oop/ under module/, with the idea being that we have
only scheme under module/. Adjusted configure.in and Makefile.am
appropriately. Put oop/ at the end of the compilation order.

module/ice-9/debugging/example-fns.scm

@@ -0,0 +1,17 @@
+(define-module (ice-9 debugging example-fns)
+  #:export (fact1 fact2 facti))
+
+(define (fact1 n)
+  (if (= n 0)
+      1
+      (* n (fact1 (- n 1)))))
+
+(define (facti n a)
+  (if (= n 0)
+      a
+      (facti (- n 1) (* a n))))
+
+(define (fact2 n)
+  (facti n 1))
+
+; Test: (fact2 3)