[Patch] inline blocks lineHeight, inline tables positioning, vertical-align fixes

[Germain Garand]

Hi,
Here is a regression tested patch addressing $subject

Please review,
Germain

* css/html4.css: 
- default tbody/tfoot/thead to vertical-align: middle
as required by spec:
    http://www.w3.org/TR/html401/struct/tables.html#alignment
- do not set vertical-align on the table: it breaks
inline-table's default (baseline).
    cf. fast/inline-block/001.html

* rendering/render_table.h
(position) remove empty reimplementation:
inline-tables need positioning. cf. fast/inline-block/001.html

* rendering/render_object.cpp 
(getVerticalPosition): inverted logic.
    cf. unsorted/RESOLVED-20423-436.html,
    unsorted/74399.html
(lineHeight/baselinePosition): inline-blocks behaves like replaced elements, 
but only after they have been layouted ( i.e when their intrinsic height is 
known). Otherwise, they behave like blocks, hence we query
the block's strut. Avoids the need for WC's isRootLinebox bool.
    cf. fast/inline-block/001.html
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