FOP-2181: Add a test case for the recent fix made in FOP-2174 and XGC-76 regarding source resolution scaling with SVG and images; patch submitted by Robert Meyer

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1448484 13f79535-47bb-0310-9956-ffa450edef68