Add a script that checks a username and password combination to see if it's a valid sucs or uni ldap account

The old server appears to have disappeared, so
the query has been updated to make authenticated
requests against the new server.

Port the printer shame script from the old site, rearrange the disk shame script (and rename it)
Also includes fixes made to the site during freshers week that haven't been committed yet

Apologies for the deluge of tiny commits. It's late and I'm incompetent.

Moved the commit button to the top of the list in a tfoot tag so that it appears even when there are errors

add a new function to save a message flash in the session data to be displayed on the next page load (e.g. when we're doing post/redirect/get)

alomst finished signup system, all the logic is there, just need to be made to look nice and the deplyment TODOs followed

signup system now generates ldifs, and adds members to the mailing lists, dont forget to remove the dev mods before deploying

UI and validation for the new signup system, actual backend functionality is started but mostly missing