2005.08.12 [gosset] Initial revision
2006.03.12 [megacz] Swapped {L1,L0}->W, FB->{L0,L1}, {H0->L0,H1->L1}
+ 2006.03.13 [megacz] Fixed lowest bit of z=00000000; it should be "1"
Background
+----+--------+--------+--------+--------+--------+--------+--------+--------+
|Z3:0| D octet |
+----+--------+--------+--------+--------+--------+--------+--------+--------+
- |0000| V4->L4 | H4->L4 | FB->L2 | FB->L3 | FB->L0 | FB->L1 | FB->L4 | 0 |
+ |0000| V4->L4 | H4->L4 | FB->L2 | FB->L3 | FB->L0 | FB->L1 | FB->L4 | 1 |
+----+--------+--------+--------+--------+--------+--------+--------+--------+
|0001| ZM->R | YL->R | WZ->WM | FB->WM | ZM->C | ZM->FB | C->XO | C->YO |
+----+--------+--------+--------+--------+--------+--------+--------+--------+