Updating and uninstalling openiboot

It's actually slightly problematic to use the "Update Firmware" feature of iTunes with openiboot installed, so I updated openiboot with an uninstall facility.

I uploaded the binaries and instructions necessary to update openiboot (and then uninstall it if you wish) to: http://www.iphone-dev.org/planetbeing/openiboot-uninstall.tar.gz