Re: psql - add SHOW_ALL_RESULTS option

Hello Peter,

>> As Tom said earlier, wasn't this fixed by 618c16707?  If not, is there any 
>> other discussion on the specifics of this issue?  I'm not aware of one.

This answer is that I had kept psql's calls to PQerrorMessage which 
reports errors from the connection, whereas it needed to change to 
PQresultErrorMessage to benefit from the libpq improvement.

I made the added autocommit/on_error_rollback tests at the end really 
focus on multi-statement queries (\;), as was more or less intended.

I updated the tap test.

-- 
Fabien.