In order for grub to be able to read the kernel regardless of whether
the image is written to a CD or a USB stick, it's necessary to autoprobe
for the filesystem using the findiso command. Add it to the grub config.
move arch-specific stuff to arch-specific subdirs and move all the
common stuff to a subdir named 'common'. Also, rename '.profile' and
'.bash_history' so you actually see them when you 'ls' the 'common' dir.
also added some helpful(?) comments to the templates.
