Fixed one typo in response_helpers which caused is_admin context variable not to work correctly. Created new checkLinkNameForId function that checks if link_name is correct when creating new user and modifying existing one. This is now used for validation instead of doesLinkNameBelongToId in UserForm clean_link_name function. The previous validation function didn't allow to create new users and modify linkname of existing ones. Additionally I created new doesLinkNameExist helper function.

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# Directions for web crawlers.

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# See http://www.robotstxt.org/wc/norobots.html.

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User-agent: HTTrack

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User-agent: puf

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User-agent: MSIECrawler

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User-agent: Nutch

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Disallow: /