Diff of /src/limit.lisp [6951fd] .. [976a50] Maximize Restore

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--- a/src/limit.lisp
+++ b/src/limit.lisp
@@ -176,6 +176,7 @@
 		    ;; *atp* prevents substitution from applying to vars 
 		    ;; bound by %sum, %product, %integrate, %limit
 		    (setq var (gensym))
+		    (putprop var t 'internal)
 		    (setq exp (maxima-substitute (m+ val var) realvar exp))))
 		(setq val (cond ((eq dr '$plus) '$zeroa)
 				((eq dr '$minus) '$zerob)