status: on ./mcreate I believe the client lock on the file and the mds

status: on ./mcreate I believe the client lock on the file and the mds
lock on the directory are both correctly enqueued.

- updated documentation regarding lock / resource refcounting
- removed unnecessary resource_getref before policy (thanks phil)
- local locks to addref, server locks don't
- variety of small fixes
- print lock/type names
- add one reference on lock for creation, put it away once for destroy
  [otherwise 0 ref locks can "live" and that causes the resources grief]
- small fix to change_resource