any_on
extern ULong any_on ANSI((Bigint*, int));
if (any_on(b,n)) {
if (k > 0 && any_on(b,k))
if (n == nbits && (n < 2 || any_on(b,n-1)))
lostbits = any_on(b,k);
any_on(Bigint *b, int k)
if ( (lostbits = any_on(b, bdif)) !=0)
lostbits = any_on(b, k1);