+o Clean up log levels.
+o Clean up introductory comments.
+o Log messages should show both original and new size of the data. The speed
+ should be probably calculated from the former.
+o Automatically tune ASORT_MIN_RADIX, ASORT_MIN_SHIFT and especially ASORT_RADIX_BITS.
+o Buffer sizing in shep-export.
+
+Improvements: