libfdisk: (gpt) remove 'Cylinders'

Signed-off-by: Karel Zak <kzak@redhat.com>
libfdisk: add fdisk_label_get_field_by_name() and const for labels

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: add --output <list> for print command(s)

Signed-off-by: Karel Zak <kzak@redhat.com>
sfdisk: add --output <list> for print command(s)

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

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