Change to version check functionality

[Paul M]

Actually, I was looking at the version check code today, and the old code [when we used threadids] is still active, and in this case could be used for what you require.

The old format is

....../misc.php?do=checkversion&pid=myproductid&t=123456

Where t=123456 is the actual release threadid, and pid is the product id you want returning in the response XML.

This does not use the pid to locate the thread, it just blindly returns the pid you send and the version information from the thread.

(It should default to using the set pid if you dont send one in the request).