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1) Given that you're dropping it, you probably don't need the diff to unconditional_global_search.diff.
2) to reduce confusion, try debian/amule.xpm instead of ../amule.xpm in debian/amule.install
3) debian/foo.xpm should be 32x32.  If you like, debian/foo.png.uu may be 48x48.  For large images, use SVG.