Commits on Mar 12, 2015

1. layout: Implement `border-spacing` per CSS 2.1 § 17.6.1 and the legacy …

   `cellspacing` attribute per HTML5 § 14.3.9.
   
   Table layout code has been refactored to push the spacing down to
   rowgroups and rows; this will aid the implementation of
   `border-collapse` as well.
   
   This commit also fixes two nasty issues in table layout:
   
   * In fixed layout, extra space would not be divided among columns that
     had auto width but had nonzero minimum width.
   
   * In automatic layout, extra space would be distributed to constrained
     columns as well even if unconstrained columns with percentage equal to
     zero were present.

   

   pcwalton committed Mar 12, 2015

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