fix delta == 1 case: version 1.0

Author: Vladimir Kotal

Changelog.txt

@@ -1,4 +1,6 @@
 
+1.0 - fixed bug in the algorithm allocating bits from the middle when
+      the delta was only 1 bit
 0.9 - fixed bug centermost algorithm :
       at the very first round the bit following the center for the even 
       number of bits was not picked

ipv6gen.pl

@@ -393,7 +393,12 @@ ()
         $str = reverse $str; 
 	$str = $tmp . $str;
       } else {
-        $str = $str . "1";
+	# This will take care of the delta == 1 case
+	if ($i == 0) {
+	  $str = "1";
+	} else {
+	  $str = $str . "1";
+	}
         $str = &zero_pad($str, $central_bit, 1);
       }
       $str = &zero_pad($str, $delta, 0);