FreeNAS Code

Don't dd on destroy, instead, just make sure that the partition table is
totally blown away.

partially replace a few raw sql queries for volumes manager from zfs_sync_datasets

use django orm in geom_disk_replace and fix a bug to allow disk replacement for UFS volumes in GUI

fix creation of single disk ufs volume;
error repoerting for ufs volume creation

use orm objects within zfs_detach_disk

replace disks within a transaction;
move disk replacement logic into form done();
use orm objects within middleware zfs_disk_replace;
error reporting in case of replacement fails

Ignore 'inherit' from upper layers when we are creating a filesystem.

create volumes within a transaction;
report volume creation errors to the user

add start/restart/stop ups methods; forgot to change ups model in services listing

write uploaded config to /data/uploaded.db and touch /data/need-update