#9 wp-admin/install-config.php missing vars and some

the latest change to wp-admin/install-config.php
introduced a bug that prevents a new wp-config.php to
be created: the variables $configFile and $handle got
removed. this patch fixes this. additionally, it fopen's the
$handle in 'wb' mode (http://php.net/fopen: "For
portability, it is strongly recommended that you always
use the 'b' flag when opening files with fopen()."), fixes
php indentation and coverts some spaces2tabs.

[Anonymous]