Grub2: partition counting should be the same as device counting

[Pjotr]

In Grub2, partition counting starts at 1. However, device counting
starts at 0 (the old method). This difference is very unfortunate and will
cause needless confusion....

Counting of partitions and devices should be exactly the same. Both of
them should start counting at 1, or both of them should start counting
at 0 (old method). No mix.

The current mix not only creates unnecessary confusion for users, but
may also cause bugs in peripheral software later on. Software
developers may not always be sufficiently aware of this mixed counting
method.

I hope you will want to reconsider this matter....