Mike Fleetwood authored Nov 27, 2015 and Curtis Gedak committed Jan 29, 2016

This is the equivalent change as made to set_mountpoints() in an earlier
commit.  Change GParted_Core::set_used_sectors() from being called with
a vector of partitions and processing them all to being called per
partition.  This is in preparation for calling set_used_sectors() on a
single Partition object inside a PartitionLUKS object.

Bug 760080 - Implement read-only LUKS support