Revision history for Perl extension VMS::Device.
0.01  Thu May 21 12:05:22 1998
        - original version; created by h2xs 1.18
0.01  Tue May 26 16:48:34 1998
    - All the items for device_info are in, along with appropriate bitmap
      decodes for them.
0.01  Tue May 26 22:54:04 1998 (Or too damn late)
    - Added device_list (sans special hash) and decode_device_bitmap
0.01  Wed May 27 13:45:23 1998
    - Changed device_list--no special hash. Now just takes two extra
      parameters.
    - Added device_classes and device_types functions. 
0.02  Wed May 27 17:03:32 1998
    - Added allocate and deallocate functions. Keen!
0.02  Thu May 28 11:32:34 1998
    - Fixed the example for total free blocks
    - #ifdef'd all the device types and classes. (Yay, perl! :) Should
      function much better on non-alpha non-7.1 systems.