rewrite of the WinIE quirk for handling collapsing margins
	at the tops and bottoms of table cells.  We match WinIE's
	behavior for all HTML4 block-level elements.

	This patch also applies a bottom margin to <form> elements,
	which is what was causing the missing space on livepage.apple.com
	underneath the textfield on the right.  WinIE and Gecko both
	put a bottom margin on all forms.

	This patch also updates the collapsing margin code to detect
	inlines that have been morphed into blocks by KHTML (this is
	so wrong, don't even get me started, you can't treat an inline
	as a block, this code is lame, etc. etc.) and to properly ignore
	their margins completely.  Fixing the code to not morph inlines
	is another architectural problem that will have to be dealt
	with (sigh).

        * khtml/css/css_valueimpl.h:
        * khtml/css/cssparser.cpp:
        (StyleBaseImpl::parseValue):
        (StyleBaseImpl::parseUnit):
        * khtml/css/cssparser.h:
        * khtml/css/cssstyleselector.cpp:
        * khtml/css/html4.css:
        * khtml/misc/khtmllayout.h:
        * khtml/rendering/render_flow.cpp:
        (RenderFlow::RenderFlow):
        (RenderFlow::layout):
        (RenderFlow::layoutBlockChildren):
        (RenderFlow::addChild):
        * khtml/rendering/render_flow.h:
        * khtml/rendering/render_object.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2406 268f45cc-cd09-0410-ab3c-d52691b4dbfc