Default to GPT on disks >= 2 TiB (#711098)

MSDOS partition table is limited to addressing 2^32 sectors, limiting
disks using 512 byte sectors to 2 TiB in size.  Fdisk reports the
following warning on disks 2 TiB and larger.

    # truncate -s 2T /var/tmp/loop-2T
    # losetup /dev/loop0 /var/tmp/loop-2T
    # fdisk /dev/loop0

    WARNING: The size of this disk is 2.2 TB (2199023255552 bytes).
    DOS partition table format can not be used on drives for volumes
    larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
    partition table format (GPT).

(Fdisk arguably reports this warning one sector too early.  Anyway for
safety and consistency GParted will use this limit too).  Continue to
use MSDOS as the default partition table type for disks smaller than 2
TiB and use GPT as the default for disks 2 TiB and larger.  This
maximises compatibility.

Also remove the advanced expander and always show the partition table
list box.

Bug #711098 - Default partition table can not handle > 2 TiB disks
Display partition table types in order (#711098)

In the Create Partition Table dialog display the entries in the combobox
in order.

Previously the default of MSDOS or GPT was moved to the first item in
the combobox.  Now the partition table types remain in order with just
either MSDOS or GPT being selected as as the default as required.

The partition table types are displayed in the order supplied by
libparted, which is alphabetic except with "loop" last.

Bug #711098 - Default partition table can not handle > 2 TiB disks
Update manual with default to GPT on disks >= 2 TiB (#711098)

Bug #711098 - Default partition table can not handle > 2 TiB disks