[HyperDB] HyperDB compatibility

[Andy Skelton]

I just updated HyperDB for compatibility with WordPress trunk at
revision 8094. No other compatibility is implied.

http://svn.wp-plugins.org/hyperdb/trunk/

db.php:
Put it in wp-content. It will function the same as core WPDB, using
the DB definitions in wp-config.php until you set up db-config.php.

db-settings.php:
Put it wherever wp-config.php lives and require it in wp-config.php
after the prefix is assigned. Follow the directions to replace the
default with your multi-db configuration.

Cheers,
Andy