Change dependencies in Makefile
When using qemu, we don't actually need to create a GRUB cd image, as
qemu supports booting the kernel (with the initrd) itself using the
-kernel options. Bochs doesn't seem to though, so that still depends on
the cd image
Remove "... done" from boot messages
Add start of PATA (IDE) driver
So far just detects if the ATA controller has no drives attached, and
not even completely definitively