More error reporting enhancements for DivNode::insertChild() and indexOf().
More error reporting enhancements for DivNode::insertChild() and indexOf().

svn path=/trunk/libavg/; revision=2908

scotty007/libavg,hoodie/libavg,th3infinity/libavg,libavg/libavg,scotty007/libavg,yyd01245/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,libavg/libavg,hoodie/libavg,hoodie/libavg,yyd01245/libavg,scotty007/libavg,th3infinity/libavg,scotty007/libavg,libavg/libavg,th3infinity/libavg,libavg/libavg