PDF viewer based on MuPDF library, way faster than PDFView.

Changes:

– Reduced batteries consumption when being idle, because the application no longer does busy waiting for events.
– Slightly faster zooming, since I removed a redundant page reload that was only needed when changing pages.
– Zooming now recalls the position on text it was displaying, so it doesn’t return to the upper left corner of the page after each zoom change.

http://archive.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,4,2593