Code review comment for lp:~jibel/livecd-rootfs/add_multi_layered_squashfses_support

> I don't have time for a full review this morning, but unless we intend to keep
> these forked from the "real" ISOs for testing for a while, and then converge,
> I really don't like the SUBPROJECT use here. I'd expect the real 'ubuntu'
> project to be building these, not some ubuntu-random-subproject project.
>
> As noted, you already can decide if you're building this type of image based
> on PASSES being defined, so it seems a bit odd to then also key on a
> subproject name.
We need a subproject because the real 'ubuntu' and the new installer work will diverge quickly. Note that Ubuntu Desktop uses the layer system on Disco with this merge proposal without defining a subproject.