expanded login system:
- the database has now an account table (updated the setup script and the scheme accordingly) => This means the database has to be rebuild!
- passwords are stored as 128 byte hashes with a random 64 byte salt using sha512 (and sha256 for the salt) => this should be secure enough for any crack attempt
- account cookies are now jason objects storing the username and the password hash
- an logout field is now displayed in the navigation bar if the user is logged in
- the required admin account is currently created by a special debug url, see the root page for further information