of wasted PixmapRequests (regressions introduced by DocumentViewport).
  Optimizations.
Document: Fixed oscillations in memory deallocator. Merged 'cleanupMemory'
  and 'freeMemory' -> 'cleanupPixmapMemory'.
  Delayed initialization of QTimers.
GeneratorPDF: Added a comment on threading and asyncronous pixmap loading.
TODO: updated adding items by Mikolaj Machowski and Grzegorz Ja?kiewicz

svn path=/trunk/kdegraphics/kpdf/; revision=380913