If a known user (based on stored cookies) is not logged in than
redirect to the login page rather than printing a message with a link to the page. Otherwise send a "403 Forbidden" to keep robots from indexing the page. Also send appreciate HTTP responses on other precheck errors to keep a robot from indexing the page. In order to do this the PAGEHEADER call needed to be moved to after CheckLoginOrDie and Required/OptionalPageArguments on many pages. A warning will be printed if either CheckLoginOrDie or Required/OptionalPageArguments detects that PAGEHEADER was already called. Also change the redirect in kb-show to be a permanent redirect (301) rather than a temporary one (302) which is the default unless a status code is given.
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