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@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com

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