[Patch] a renderer for <FIELDSET> and <LEGEND>

[Germain Garand]

Hello there,

I noticed a while back that HTML 4's <FIELDSET> and <LEGEND> elements didn't 
have a renderer in KHTML, so I've worked on this topic.
It was ennoying to sometime miss forms because they were wrapped in those.

I intended to respect HTML 4.01's DTD, so tell me if I've missed something.

Here is a testcase: 
http://www.phoenix-library.org/germain/testcases/testfieldset.html

And a screenshot after patch :
http://www.phoenix-library.org/germain/shots/konq_fieldset.png

Cheers,

Germain