#17 Remove re-login prompt for WEB_AUTH users

[Alfred Ellis]

When you leave the browser sitting too long on
Webcollab and the session times out, the next request
prompts you to re-login. For users that authenticate
through the web server, this can get annoying.

This patch is a direct replacement for
includes/security.php in Webcollab 1.71. I haven't had
a chance to compare it to CVS, yet.

If Webcollab is not configured for WEB_AUTH, these
changes should not effect the installation.

If Webcollab is configured for WEB_AUTH, performing an
action after the session timeout should create a new
session ID for the user and then perform the requested
action. If this isn't the case, then I've done a very
poor copy-and-paste job...

[Alfred Ellis]

Updated security.php June 2, 2005