* move bas_ext from the handler to the handlerton

* provide a default bas_ext value of the empty list

storage/example/ha_example.h

@@ -72,11 +72,6 @@ public:
    */
   const char *index_type(uint inx) { return "HASH"; }
 
-  /** @brief
-    The file extensions.
-   */
-  const char **bas_ext() const;
-
   /** @brief
     This is a list of flags that indicate what functionality the storage engine
     implements. The current table flags are documented in handler.h