#27 BannerXchange sql file change

[Gordon Forsythe]

The sql file needs to be changed for adding more than
one banner to work. The sql should look like this:

CREATE TABLE nuke_bannerx (
xid smallint(6) NOT NULL auto_increment,
xname varchar(50),
xtext text NOT NULL,
PRIMARY KEY (xid)
);

All that's changed is removing 'default 0' and adding
auto_increment.

Would be nice to know who clicks on the banners, but
that'd be kinda tough to do with flash. Oh well.
Excellent work so far!