fdisk: mark -s option as deprecated

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

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: use fdisk_info() to print geometry

Signed-off-by: Karel Zak <kzak@redhat.com>
fdisk: improve info output

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