Rename internal types:

a suffix ending with _ct means confidential type
ans is reserved for M*LIB internal usage.

OPLIST doesn't use the external types
but rather the internal types.
It enables to be independent of the real names
of the external types.
Such external names are planned to be fully customizable
(i.e. the user may define a name that suits its coding style)

m-c-mempool.h

@@ -677,7 +677,7 @@ m_gc_sleep(m_gc_t gc_mem, m_gc_tid_t id)
 
 /***********************************************************************/
 /*                                                                     */
-/*                              VLA MEMPOOL                            */
+/*                    Variable Length Array  MEMPOOL                   */
 /*                                                                     */
 /***********************************************************************/