Merge of needsLayout and childNeedsLayout from Webcore/125

[Allan Sandfeld Jensen]

Hi!

I am trying to merge various bits from Safari while learning KHTML 
(low-hanging fruit and all). 

One of the larger, is the change from layouted() to needsLayout() and 
relatives in renderObject; it touches almost every file in the rendering 
directory.  Most of the changes are fortunatly trivial (some of the them 
involving satisfying removal of "// #HACK!" comments). There are however a  
few I have doubts about, which is why I post it here. 

During the merge I found I few places in our KHTML where we called 
layouted(false), but where the equivalent calls in Webcore was missing. I am 
guessing these removals are optimizations from Apples side, but I haven't 
quite wringed my head around the rendering-callgraph enough to be sure. These 
have been converted but commented-out in the attached patch. There are a few 
places in render_block.cpp, render_container.cpp and one in 
render_inline.cpp.

Anyway here is the patch (with more slave-labouring merging to follow)

`Allan
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