change from /jffs to /overlay, patch from Daniel Dickinson

include/image.mk

package/base-files/Makefile

package/base-files/files/lib/firstboot/20_no_fo_mount_jffs

package/base-files/files/lib/firstboot/30_is_rootfs_mounted

package/base-files/files/lib/firstboot/30_no_fo_pivot

package/base-files/files/lib/firstboot/40_copy_ramoverlay

package/base-files/files/lib/firstboot/50_pivot

package/base-files/files/lib/firstboot/99_10_no_fo_cleanup

package/base-files/files/lib/functions/boot.sh

package/base-files/files/lib/preinit/40_mount_jffs2

package/base-files/files/lib/preinit/70_pivot_jffs2_root

package/base-files/files/lib/upgrade/common.sh

package/base-files/files/sbin/firstboot

package/block-extroot/files/50_determine_usb_root

package/block-extroot/files/60_pivot_usb_root

package/opkg/files/opkg.conf