Viewport MOD 1. Implemented the DocumentViewport class, owned by Document.
A const reference may be asked. When set all DocumentObservers will be notified so they can update their gfx if needed. Converted TOC, Links to the new usage. DocumentViewport can be saved/restored to/from QString so it can be asked as metadata and saved on document's XML. When loading a document the viewport is restored exactly where it was when the document was closed. More fixes with Viewport class. Swapped groupboxes in Perform dialog. Changed members naming in DocumentObservers and inherited classes. PageView and ThumbnailsList now linked. Still regressions / TODOs about the Viewport thing. svn path=/trunk/kdegraphics/kpdf/; revision=377066
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