We touched everything, but it's not as scary as it looks.

We touched everything, but it's not as scary as it looks.

- dramatically reorganized and simplified the headers.  Most of the nasty
  recursive definitions are gone, and obd_class.h no longer drags in the
  entirety of Lustre.
- .cvsignores updated and cleaned
- added another chunk of DLM code and a test, which passes (note that it doesn't
  free the locks yet, so don't expect to cleanup afterwards)
- fixed OBD_ALLOC/OBD_FREE in the same ways as the Portals macros
- removed a lot of dead obd_class code