1.) Chris Bowditch's patch on padding-start implemented. (Changes were

1.) Chris Bowditch's patch on padding-start implemented.  (Changes were
extended to implement part of padding-end as well.)

2.) Switched from TOP/BOTTOM/LEFT/RIGHT to BEFORE/AFTER/START/END
in CommonBorderAndPadding--this is more appropriate for BlockLayout,
also the various places calling it already were either (1) commenting
on the need to switch to the above, or (2) placing the results of the
above functions using the former constants into variables emphasizing
the latter.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@197023 13f79535-47bb-0310-9956-ffa450edef68