-merged SD and USB kernel into a single one
-fixed a very small bug in both DI and SD code, probably a very few people will have a benefit from that
-removed loader.elf and boot.dol since everything only takes the loader.dol anyways, lets not waste any space
-general code cleanup

git-svn-id: http://nintendon-t.googlecode.com/svn/trunk@233 6acfca08-c3de-247c-4448-9f1a92385553