setup-storage+gpt: alignment aware?

[Thomas Neumann]

> the reasoning from /usr/share/fai/setup-storage/Sizes.pm:
>
> # on gpt-bios we'll need an additional partition to store what
> # doesn't fit in the MBR; this partition must be at the beginning,
> # but it should be created at the very end such as not to invalidate
> # indices of other partitions

Something's not right. Starting at sector 41942767s (of is not exactly 'at
the beginning'

Maybe

disk_config disk1 disklabel:gpt
primary -    1  -    -
primary swap 8G swap sw
[...]

and manually setting the "bios_grub" flag afterwards is going to achieve
the intended result.

We'll see.