Fix broken User link_name validations. Changes in r1014 still caused some problems so I came out with new idea to compare User accounts (previously called "id"). Patch by: Pawel Solyga

# Directions for web crawlers.
# See http://www.robotstxt.org/wc/norobots.html.

User-agent: HTTrack
User-agent: puf
User-agent: MSIECrawler
User-agent: Nutch
Disallow: /