UI for partition editor (Create Custom Layout)

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https://bugzilla.redhat.com/show_bug.cgi?id=574121

In the installer, some users prefer custom partitioning.  I use it
to maintain several boxes that contain a "bare-metal" non-virtual
instance of each version that my customers use.  Some machines have
several harddrives, each with a dozen or so root partitions.  I use
volume labels [blkid;  tune2fs -l; etc.] to help keep track of which
system is which.  My typical labels encode the brand (Fedora, CentOS,
Ubuntu, Windows, ...], the release number and level (alpha, beta, final),
and the wordsize (32 or 64.)

Using labels is particularly important because the order of harddrive
discovery is random (/dev/sda need not designate the same drive
from boot to boot) and UUIDs are too cumbersome except for verification.
Virtualization is not an option because it is not inter-operable
with all systems, it distorts performance measurements, and because
in the past it was too buggy.
LVM is not an option because it is not inter-operable with all systems,
and because its calculus is not complete (there is no primitive command
to remove a partition from the bag of blocks.)

Recent anaconda Create Custom Layout dialogs have been hard to use
because the filesystem label is omitted, for both choosing and editing
a partition.  Also, the Edit dialog not only omits the existing label,
but also offers no chance to specify a new label after formatting.

The way I set up a new system is to use fdisk/parted/gparted to create
a new partition from free space, and mkfs a vfat/ext2/ext3/ext4
filesystem with label.  Then in anaconda I find the same partition
by label [currently I do this using bash text commands on VT2]
and re-format it always, in order to capture the installer's default
parameters for the filesystem.

So, I'd like to see a Custom partition chooser/editor that displays
the label for each partition, and allows to specify a new label whenever
formatting.  There is plenty of space: 1/2 to 2/3 of the screen.
I favor displaying the label and the UUID always, although I can
understand others wanting /dev/disk/{by-id,by-path,by-partlabel}.

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