Function check_temporary_passwords

Checks what a user entered against any currently valid temporary passwords on their account.

Package: awl\Session
Copyright: Catalyst IT Ltd, Morphoss Ltd http://www.morphoss.com/
License: GNU GPL v2 or later
Author: Andrew McMillan andrew@mcmillan.net.nz
Located at Session.php

Parameters summary
`string`	`$they_sent`	What the user entered.
`integer`	`$user_no`	Which user is attempting to log on.

Return value summary
`boolean`	Whether or not the user correctly guessed a temporary password within the necessary window of opportunity.