Source field insertion makes every infohash different so this doesn't do
anything

Untested partial fix for issue #36

- Check post size
- Use prepared queries
- Remove now-pointless injection protection

Tenboro said to

This includes complying with standards that allow mobile browsers to
create a pseudo-app out of the site, complete with homescreen icon,
splash-screen, and a minimal browser-less UI

Some minor functionality will need to be reimplemented later
Not a priority though