Re: doco on bitwise logicals

[Kevin Ryde]

I wrote:
>
>       * scheme-data.texi (Bitwise Operations): ...

Also sneaking in here (in the patch but not stated) is a fix for
lognot to say ones-complement, where it says twos-complement now.
This would be a fix for the 1.6 branch as well as the mainline I
think.

 - Scheme Procedure: lognot n
 - C Function: scm_lognot (n)
     Return the integer which is the ones-complement of the integer
     argument, ie. each 0 bit is changed to 1 and each 1 bit to 0.

          (number->string (lognot #b10000000) 2)
             => "-10000001"
          (number->string (lognot #b0) 2)
             => "-1"