vinum_init(): Change name of variable plexindex to objindex, which
better describes its purpose.
initsd(): Add a second parameter to determine whether it should wait
for completion or not. This allows it to DTRT when called
with the -w flag either directly or via initplex().
Add 'setstate' command (function vinum_setstate ()) to implement the
VINUM_SETSTATE_FORCE ioctl for diddling individual object states.
This is a repair tool which can also be used for panicing the system.
Use with utmost care if at all.
Add unimplemented commands 'checkparity' and 'rebuildparity'. Watch
this space.
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