Technical notes on version 2.2
General:
+03May08
+kes Implement regression that explicitly tests swapping a Volume
+ from one drive to another.
+kes Enhance disk-changer to detect most error conditions.
+kes Fix SD code so that it properly swaps a Volume between drives.
+ This fixes bug #1083.
01May08
kes Prevent a Volume that is being swapped from being freed from
the volume list. This will most likely fix, at least partially,