fdisk: add bsd, dos and sgi menus

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: use new menus

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: make internal command line case sensitive

Hey, this is Linux, year 2013...

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: (sgi) don't try to convert MBR to SGI

.. because there don't have to be old MBR at all.

Signed-off-by: Karel Zak <kzak@redhat.com>