Adds check to make sure attempted data modification exists before disabling account

Since data might be deleted but also open in another tab, don't want to block accounts
for acidentally attempting to save something that was just deleted
Disabled account if attempting to access admin account tools without authorization
Adds account disabling to task list

Allows users who have been blocked or disabled to clear the session variable using
the logout.cgi script
Adds link to disabled/blocked page allowing users to reset session parameters