ALSO
* ALSO ( -- )

a DUP on the search >ORDER - each named vocabulary
replaces the topmost >ORDER vocabulary. Using >ALSO
will make it fixed to the search-order. (but it is
not nailed in trap-conditions as if using >DEFAULT-ORDER )
 order:   vocn ... voc2 voc1 -- vocn ... voc2 voc1 voc1

search ordinary primitive