FreeNAS Code

Implement a middleware call for (forcibly) releasing snapshots from
replication system.

move reload("disk") outside the transaction block

middleware function to determine fs of a path

use simple chmod/chown for UFS

GUI portion to handle windows acl

ACL fixes for notifier.

Modified notifier to use chmod through the FreeNAS NFSv4 ACL API.

Modified to use NFSv4 ACL module

Rewrite _vdev_type to eliminate duplicated strings, this fixes #496

Bump copyright year.