XWIKI-10689: Upgrade to JFreechart 1.0.18
XWIKI-10689: Upgrade to JFreechart 1.0.18

pbondoer/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,pbondoer/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform