Add a testcase for a bug in TableStepper spotted during the refactoring. The border-before of the primary grid unit was taken into account instead of the whole cell border. If the cell is spanning over two columns and the border-before for the second grid unit is bigger, this was leading to a wrong step computation.
xmlgraphics/fop/trunk/test/layoutengine/standard-testcases/table-stepper_colspan_border-before.xml