Caption box should not have extra 10px

[atoon]

The div created when one insert an image with caption has the width of the image plus 10px for a padding effect. I think that the extra 10px should be removed and the padding be handled thought CSS, since it cause problems with custom templates.

It's very easy to copy the function that parses the [caption] shortcode to the theme's functions.php and redefine all of the tags/settings, then use the filter 'img_caption_shortcode' to replace the default.