PDFGenerator:
  Changed parser to deal with the new data structures:
  1) Popups are not inserted anymore as annotations, but parsed and
  scheduled for later merging with other annotations. Shared popups are
  permitted (the pdf reference doesn't clarify on this, so we better
  support them).
  2) Annotations can have an internal hieracy. When an IRT annotation is
  found, it's parsed and scheduled for later merging in the parent's
  tree.
  The merges take place at the end of the annotation retrieval. At that
  point all cross-objects are in memory and we can resolve/reparent
  stuff.

README.Annotations:
  Note on internal parser.

svn path=/branches/kpdf_annotations/kdegraphics/kpdf/; revision=403219