Fix preloading. It does real good now.
Fix cache deallocator. Hard avoids swapping memory or filling it up to the limit (allocated pages are referenced in an internal add/remove FIFO). Merged open and open_recent buttons as many users requested. Using viewmag icon for find-as-you-type popup. Disabled debug output. Updated todo with the roadmap to release. - Need to audit the memory code and choose good default policies now. svn path=/trunk/kdegraphics/kpdf/; revision=380494
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