* gnu/installer/parted.scm (data-partition?, metadata-partition?,
freespace-partition?, normal-partition?, extended-partition?,
logical-partition?): Remove, as now provided by Guile-Parted.
* gnu/installer/newt/partition.scm (run-disk-page): Remove disk-destroy calls,
replace disk-delete-all by disk-remove-all-partitions and
disk-delete-partition by disk-remove-partition*.