More helper functions
Set CGI session expiry to 1 week
Update the vote html creation function

Added the field for providing a name, intended to be used in status
messages for the waiter.
Updated some functions

Getting the timestamp of the last vote by IP now includes a session,
allowing someone to vote on multiple sessions from the same IP.

Adjusting the session time uses sessionid now, instead of session_key,
which is more sensible.

Indicate negative time with the human_time function
Fixing to work with function changes

- Get the sessionid from session_key to modify time on a session
- Fix how the wait and remaining time are calculated
Signup page now logs in properly
Functioning voting page