as we want to create release packages per device too

Maintaining and releasing the skulls project is something I like to do
but also something that is not exactly becoming more easy when
time is scarse and there is no compensation at all :)

- don't output path to systemctl to stout

Fixes #142

Closes #133

This is what could go to blobs/x230/ in Heads.

see #125

to the current state in coreboot/util

this should be stuff used by any supported type of hardware and helps #93
or #102

thanks for the link in #103

see #100

change to working dir for the scripts that use util/.

put some emphasis on choosing an image and support flashing any 4M image
externally.