HAMMER utilities:

HAMMER utilities:

* Add a 'show' command to the hammer utility.  This command dumps the B-Tree
  for a HAMMER filesystem, allowing me to see just how bad my spike code
  currently is.

* Remove the ClusterSize global (well, move it to newfs_hammer), the
  hammer utilities pull the cluster size out of the volume header.

* UsingSuperClusters is only used by newfs_hammer.  Super-cluster use
  can be controlled on a volume-by-volume basis so pull the information
  out of the volume header.