todo

通用SCSI设备备份/读写程序

1 Add a 'timeout' command to adjust the timeout (timeout will be in seconds!).
1 Adjust timeout lenghts for various operations now that the low level
 SCSI routines now support timeouts. 
1 Add IES command (sets CDB[5] to something in routine Inventory() ).
1 Increase the timeout for Inventory() commands to something *BIG*.
1 Fix 'scsitape' READ and WRITE so that block counts work.
2 Fix ports to other Unixes/VMS.
2 Port to AIX (no longer care about SCO Unix).
2 Add a range to 'mtx status' so that we request status only of 
  the elements we're interested in, rather than of all of them.
  (nice for the very big loaders!). 
3 Better Import/Export port support?
3 Create a TCL/TK GUI front end (otherwise managing big libraries is HARD!).