Improvements/Bugfixes for PDF attachments (embedded files):

Improvements/Bugfixes for PDF attachments (embedded files):
- Acrobat doesn't like indirect objects for the /Length entry of embedded files (make on-the-fly generation more easily configurable).
- Added the /Size entry for embedded files to keep Acrobat happy.
- Moved the embedded files' Names tree to the end of the PDF to be on the safe side.
- Made hyperlinks to embedded files work by using a JavaScript Action (thanks to Matthias Reischenbacher for that idea).
- Added sorting to the names tree node because Acrobat relies on it.
- Added some filename manipulation code to work around possible encoding problems with special characters in the filenames.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@985843 13f79535-47bb-0310-9956-ffa450edef68