Reviewed by Maciej.

    Reviewed by Maciej.

        - omit the margin and padding boxes for display types where they are ignored
        - use CSS instead of properties for table spacing and padding as suggested by Tim H.

        * WebInspector/webInspector/inspector.css: Added rules for spacing and padding.
        Added rules that hide the margin and padding boxes (borders and all but the center cell)
        when the hide attribute is present.
        * WebInspector/webInspector/inspector.html: Added classes for the rules above.
        Removed cellpadding and cellspacing attributes.
        * WebInspector/webInspector/inspector.js: Added code to hide/show the margin and
        padding boxes based on the display type.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15729 268f45cc-cd09-0410-ab3c-d52691b4dbfc