Add control of sub-oplist when creating a new oplist of a container

Add test case of this new control
Fix some corner bugs in some containers evolving their own oplists.

m-array.h

@@ -53,10 +53,18 @@
    so that all arguments are evaluated before further expansion */
 #define ARRAYI_OPLIST_P1(arg) ARRAYI_OPLIST_P2 arg
 
+/* Validation of the given oplist */
+#define ARRAYI_OPLIST_P2(name, oplist)					\
+  M_IF_OPLIST(oplist)(ARRAYI_OPLIST_P3, ARRAYI_OPLIST_FAILURE)(name, oplist)
+
+/* Prepare a clean compilation failure */
+#define ARRAYI_OPLIST_FAILURE(name, oplist)		\
+  M_LIB_ERROR(ARGUMENT_OF_ARRAY_OPLIST_IS_NOT_AN_OPLIST, name, oplist)
+
 /* OPLIST definition of a dynamic array */
 /* FIXME: Do we want to export some methods as they are slow and 
    are not fit to be used for building other methods (like _it_remove)? */
-#define ARRAYI_OPLIST_P2(name, oplist)					\
+#define ARRAYI_OPLIST_P3(name, oplist)					\
   (INIT(M_C(name, _init))                                               \
    ,INIT_SET(M_C(name, _init_set))					\
    ,INIT_WITH(API_1(M_INIT_VAI))                                        \