{{{
Added DB_SECONDARY_BAD to db.h
Added DB_CURRENT to db.h

    DB->get         (now returns DB_SECONDARY_BAD when appropriate)
    DB->pget        (now returns DB_SECONDARY_BAD when appropriate)
    ** DBC->c_get   (works with associate)
    ** DBC->c_pget  (added function, works with associate, but not in header yet)
    ** *DBC->c_del  (works with associate)
    *DB->del        (works with associate)

*   May not work properly with duplicates.
*   Question: Do I have to use
        search_val.flags = DB_DBT_MALLOC;
            and
        free(search_val.data);
**  Requires DB_CURRENT to be supported in toku_brt_cursor_get
}}}
addresses #48


git-svn-id: file:///svn/tokudb@890 c7de825b-a66e-492c-adef-691d508d4ae1