Update ChangesList output for enhanced changes to use CSS instead of obsolete attrbut...

Update ChangesList output for enhanced changes to use CSS instead of obsolete attrbutes and elements (cellpadding, <tt>, etc.)
The test page I was using successfully validated as HTML 5 :)
Tested for signs of obvious regressions in FF 3.5, IE8, Opera 9.64 and Safari 4.0.
Supposedly, the border-spacing property isn't supported by IE, but I didn't see any obvious issues when testing,
so either the information I got was wrong/outdated, or its not actually necessary here. Needs testing in IE6/7 to verify.
If I did everything right, there shouldn't be any visible changes, save maybe a couple trivial spacing quirks.