[RFC] Remove requirement of alignment to track from MBR scheme

[Poul-Henning Kamp]

In message <BF2C4EFE-C43D-4AB2-BBF4-9D0F92B112A9 at mac.com>, Marcel Moolenaar wri
tes:

>md does not have geometry
>information, causing certain tools to work less well.

SYNOPSIS
     mdconfig -a -t type [-n] [-o [no]option] ... [-f file] [-s size]
              [-S sectorsize] [-u unit] [-x sectors/track] [-y heads/cylinder]

					^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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