font sizes overhaul

[Germain Garand]

Hi,
I started some work some time ago to bring CSS 2.1 conformance on font-sizes 
(*). The attached patch is the outcome of that work.

This also notably brings a new quirk that is the result of a close study on 
how IE 6 handles absolute font-sizes in quirk mode (see attached testcases).

I owe much to this article for providing a clear and thorough explanation on 
font sizes problems:
http://style.cleverchimp.com/font_size_intervals/altintervals.html

Last, it also applies a fix for #91228 (zooming must not be applied to 
relative values, because the parent as already been scaled).

The patch is meant to go with Stephan's excellent doctype sniffing work :)

Please tell me what you think.
Greetings,
Germain

(*) http://www.w3.org/TR/CSS21/fonts.html#font-size-props
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