fix #8742 - update svgsalamander to release 0.1.18+patch (fix bug SVGSALAMANDER-26) -> allow to open more SVG files

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6002 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror