Candidate commit: "white-space: pre"

[Allan Sandfeld Jensen]

Hi everybody and "glædelig jul"

I've attached my candidate commit patch for CSS "white-space:pre".
All major regressions and problems have been eliminated, and only a few minor 
issues remain. So I would ask for your oppion before commiting.

It currently produces 4000 changes in the regression-suite. More than half of 
these are pure DOM changes (explicit white-space), and most of the rest are 
added RenderText objects for the new white-space. A much smaller number have 
real painting changes:
* There are wierd changes (both good, bad and plain odd) in some of the 
mozilla dom-tests, it will definitly need investigation.
* There are small position changes for some form and object elements. Such as 
mozilla/dom/dom-html/hfor*.html
* Misparsing of some closed list elements: 
mozilla/html_401/dir_li_element.html
* Misparsing of corner-case title:
mozilla/htmlparser/title.html

After this have been accepted I will clean my added support for pre-line and 
pre-wrap CSS 2.1 values. With that we will surpass Safari in CSS support.

`Allan
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