Support arch linux-any.
+ If os=linux, then modprobe and enable zfs partitioner.
+ Make absolutly sure that /boot/zfs exists before trying to import
  a ZFS pool - will fail if pool exists, but /boot/zfs doesn't.
+ Since loading the module might take 'a while', show progress info.
+ Don't automatically mount the file system(s) when importing the pool.
If os=linux, then create the ZVOL with volblocksize=4096.
Add some support functions: fs_create(), fs_check_exists(), get_vg_value().
Support creating and mounting a ZFS (not ZVOL) and make it a root file system.