New atusd errata and a few small CAM updates.

- atusd/ERRATA: added errata section for version 20100908
- atusd/cam/doit: increase tool clearance from 1.5 mm to 2 mm
- atusd/cam/pcb.pl (cut): cutting counter-clockwise did not reduce burr.
  Removed reversal of cutting direction.
- atusd/cam/pcb.pl: made area selection formulas easier to understand

atusd/ERRATA

@@ -1,3 +1,5 @@
+Version 20100903:
+
 - changed C7 to 1 nF to debug a signal attenuation problem. Turned out to be
   a bad trace. According to simulations, 22 pF should be more than enough.
 
@@ -10,3 +12,8 @@
 - not an erratum, but with experiments showing power-on reset to be
   reliable, we can consider removing the hardware reset circuit. This will
   also simplify the layout.
+
+Version 20100908:
+
+- SPI activity causes the PLL to unlock. Specifically, toggling nSEL does
+  this.

atusd/cam/doit

@@ -18,5 +18,5 @@ $GEN |
   awk '{ if ($3 != "") $3 += '$Z'; print $0; }' |
   $ALIGN 0 1 $rect |
 	# angle, reference (lower left corner), rect
-  $GP2RML 1.5 0.1 0.1
+  $GP2RML 2 0.2 0.2
 	# clearance, xy speed, z speed

atusd/cam/pcb.pl

@@ -34,7 +34,6 @@ sub cut
     local (*fn) = $_[0];
 
     shift @_;
-    reverse @_;
     if (defined $x) {
 	if ($x == $_[0]+$x0 && $y == $_[1]+$y0) {
 	    shift @_;
@@ -76,9 +75,11 @@ sub one
 
 
 $z = -0.8;
+$col = 0;
+$row = 1;
 # x: corner offset, compensation for rotation, array position
 # y: corner offet
-&orig(5+54*1, 5+30*0)
+&orig(5+54*$col, 5+33*$row)
 &one(*same);
-&orig(5+54*1+15+&mil(1340), 5+30*0+&mil(1030));
+&orig(5+54*$col+15+&mil(1340), 5+33*$row+&mil(1030));
 &one(*rot);