Removed @ symbol from db connection calls

I have just spent a few hours scratching my head over why we were getting a white screen on our EE install. It turns out the php-mysql module wasn't installed.. but because the @ symbol is used on the connection command it was *impossible* for us to know this.

It's a bad idea to use the @ symbol 99% of the time. Please read this for more info: http://www.phptherightway.com/#errors

I am an experienced developer, so a newcomer would almost certainly have given up.