Cleaner support for multiple tournaments

[GoogleCodeExporter]

We should switch from hard-coding t={$mysql_prefix} in every link in favor
of PHP's built-in URL-rewriting:

bool output_add_rewrite_var  ( string $name  , string $value  )

This is documented at
http://www.php.net/manual/en/function.output-add-rewrite-var.php .

Original issue reported on code.google.com by ajlyon on 28 Nov 2009 at 5:50