Explain the reason for the extra flag on this function.
SVN revision: 77339
/**
* Add a callback to be called when unique id of a bus name changed.
*
+ * This function implicitly calls edbus_name_owner_get() in order to be able to
+ * monitor the name. If the only interest is to receive notifications when the
+ * name in fact changes, pass EINA_FALSE to @param allow_initial_call so your
+ * callback will not be called on first retrieval of name owner. If the
+ * initial state is important, pass EINA_TRUE to this parameter.
+ *
* @param conn connection
* @param bus name of bus
* @param cb callback