FormattingResults mechanism ported from maintenance branch to trunk.
Submitted by: Manuel Mall <mm.at.arcus.com.au>
Patch tweaked slightly to avoid the reference of Fop.java into the area package.
git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@226511 13f79535-47bb-0310-9956-ffa450edef68