9-beta1 installer - partition editor

[Ivan Voras]

Unfortunately, I continue to have problems with the partitioner part of
the installer in the BETA2 image. See the (unchanged) problem
screenshots here:

http://ivoras.imgur.com/freebsd_installer_2

See also the screenshots of the entire process here (on BETA1):

http://ivoras.imgur.com/installer__partitioner

I am no longer trying to create a swap partition but still:

1) I cannot proceed without specifying a root partition
2) I cannot specify the root partition (the dialog ignores it).

If this doesn't get solved, it makes FreeBSD uninstallable in this case.
There may be some kind of interference between the existing MBR scheme
and the operations that the installer attempts to do.