Re: psql - factor out echo code

>> Attached v4 simplifies the format and fixes this one.
>
> I think this goes way way overboard in terms of invasiveness. There's no
> need to identify individual call sites of PSQLexec. [...]

ISTM that having the information was useful for the user who actually
asked for psql to show hidden queries, and pretty simple to get, although
somehow invasive.

> It also looks like a mess from the translatibility standpoint.
> You can't expect "%s QUERY" to be a useful thing for translators.

Sure. Maybe I should have used an enum have a explicit switch in
echoQuery, but I do not like writing this kind of code.

Attached a v5 without hinting at the origin of the query beyond internal
or not.