Similar fixes need to be handled in the susignup component

Allows staff to start sign up process for students who have paid but not yet signed up, including those who don't have their SU transaction ID.

Should coexist peacefully with existing signup system and the new SU signup component

Added initial version of SU API implementation for freshers fayre, still needs error checking adding, though now ready for testing, improvements welcome.

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

Allow admins to remove unrequested junk items, no questions asked. (plus a little extra error handling)