1. tie the LMIter objects to their LM "parent"

1. tie the LMIter objects to their LM "parent"
2. tie the PageLayoutManager object to its parent LayoutManagerLS
3. create methods for going up the LM tree to get to the LayoutManagerLS
4. store an AddLMVisitor object in LayoutManagerLS so that subclasses can be stored there and used instead of AddLMVisitor itself (so that third-party users can subclass instead of modifying AddLMVisitor)
5. use the stored AddLMVisitor instead of creating one for each LMIter
6. add some accessor methods to AddLMVisitor so that subclasses can use Lists stored therein

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196901 13f79535-47bb-0310-9956-ffa450edef68