Feature improvement for FETCH tab completion

Hello!

I’d like to improve the FETCH tab completion.

The FETCH tab completion . Therefore, this patch fixes the problem.

Previous function completed one of FORWARD, BACKWARD, RELATIVE, 
ABSOLUTE, but now it completes one of FORWARD, BACKWARD, RELATIVE, 
ABSOLUTE, ALL, NEXT, PRIOR, FIRST, LAST and Corresponded to later IN and 
FROM clauses.

Regards,

Naoki Nakamichi