* Defer the binding of PCData to struct elems using a placeholder mechanism.
* Translate text nodes to marked-content sequences in IF structure tree.
* Replace ptr with structure tree element.
* Re-order table footers so they appear at the end of the structure tree.


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ImproveAccessibility@1236718 13f79535-47bb-0310-9956-ffa450edef68

The structure tree is now directly converted into corresponding PDF objects.
When going the IF route, the structure tree is stored in the form of SAX events that will be re-played when it's time to stream them into the output. This may still change.

* Extracted RFC3066 methods from XMLUtil into new LanguageTags class that can be re-used in a non-XML context.
* Dropped support for accessibility in the old Area Tree XML.
* Added support for the xml:lang property on fo:root, so that the global language can be set for the document without retrieving the language from the first page-sequence.
* Renamed StructureTreeBuilder into more appropriate StructureTreeEventHandler (same for applicable sub-classes)
* Renamed StructureTreeBuildingFOEventHandler into FO2StructureTreeConverter and added test case
* Added test cases for classes in the StructureTreeEventHandler hierarchy


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ImproveAccessibility@1205935 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@830293 13f79535-47bb-0310-9956-ffa450edef68