made svg context independant so that the svg document does not hold onto the fo tree
made svg context independant so that the svg document does not
hold onto the fo tree


git-svn-id: 102839466c3b40dd9c7e25c0a1a6d26afc40150a@194656 13f79535-47bb-0310-9956-ffa450edef68

chunlinyao/fop,apache/fop,apache/fop,chunlinyao/fop,chunlinyao/fop,apache/fop,apache/fop,apache/fop,chunlinyao/fop,chunlinyao/fop