Invisible PROMPT2

[Thomas Munro]

Hello hackers,

>From the advanced bikeshedding department: I'd like my psql
transcripts to have the usual alignment, but be easier to copy and
paste later without having weird prompt stuff in the middle.  How
about a prompt format directive %w that means "whitespace of the same
width as %/"?  Then you can make set your PROMPT2 to '%w   ' and it
becomes invisible:

pgdu=# create table foo (
         i int,
         j int
       );
CREATE TABLE
pgdu=#

invisible-database.patch
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