Better auth errors from libpq

Folks,

Far and away the most common question we get in IRC includes phrases
like:

psql: FATAL: Ident authentication failed for user "root"

This isn't exactly informative to newbies, so I'm proposing a patch
like that attached for such failures. Instead of seeing that
mysterious message, they'd get something like this:

psql: FATAL: Ident authentication failed for user "root"
HINT: Is pg_hba.conf set properly on the server?

Also good would be some way to make man pages and whatever Windows
uses both for pg_hba.conf and for postgresql.conf. Any hints as to
how to start this would be most welcome :)

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
Skype: davidfetter XMPP: david(dot)fetter(at)gmail(dot)com

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