[agora] Thread locking ineffectual (patches included)

[Chuck Hagenbuch]

Quoting sayotte at alkaloid.net:

> Thread "locking" removes the Reply link from the threads view, but does not:
> a) prevent actual replies from being made at the lib/ level
> b) prevent the Reply To (...) form from being displayed when viewing
> messages in locked threads

Cleaned up and committed, thanks.

-chuck

-- 
"we are plastered to the windshield of the bus that is time." - Chris