-In order to make lttv_hooks_call aware of the different kind of hooks it has to
-call, the LttvHooksById will be modified to integrate a new "main" list : a
-pointer to a LttvHooks that will be called for any Id.
-
-A new lttv_hooks_by_id_call that will get the hooks from the main and by_id
-lists in the right order will deal with the multiple lists priority problem.
+A new lttv_hooks_call_merge that will get the hooks from two hook lists in the
+right order will deal with the multiple lists priority problem.