We use this to set various sysctl settings, like setting kernel.printk=1
so we don't get the screen all crudded up with kernel messages during
text-mode installs.
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.
