* Added a new category
* Add deletion support to batch tag updater
* Bug fixes

When USER_LIMIT == 0 (no limit) $UserCount is always > USER_LIMIT so
the notice is always shown. Actually this commit just implements the
exact opposite of the logic on line 137.

Also create seperate account security options page

This commit requires a new database table

These features only have any value if users actually use them, and
experience has shown that nowhere near enough users use them to make
them worthwhile.

This was an automatic mass-replace. Manual replacement of array(...)
will continue

ISPs can't see filenames through TLS. This option is useless in a
codebase that forces HTTPS, and only confuses users.

Tooltips: fix on user page

Fixes #27

- Default interval now 30 seconds (breaking!)
- Don't add default parameters to QR code (smaller)

Fixes #22

This involves temporarily decrypting all values being searched and
inserting them into a temporary table. Creation of this table can be
very slow when IP history is optionally searched. It might be better to
not make the temp table and just do the IP filtering from PHP.

Fixes #2

I swear one of these days I'll just do a search and replace all of them

Note that this requires a minor database migration of SiteOptions in
users_info and Paranoia in users_main

2FA class stolen from RobThree and stripped down.
Works best with qrencode utility installed, but will fall back to using
google charts if qrencode is missing.

For real though how was this even left broken like this? Did what.cd
just never use this feature or did they only half-port it to their
public repo?