2000-08-03  Morten Welinder  <terra@diku.dk>

	* numtheory.c (func_bitlshift, func_bitrshift): Handle large bit
 	counts.  Handle negative counts.
	(func_bitxor): New function.
	(gnumeric_nt_mu): New function from Pablo De Napoli
	<pdenapo@mate.dm.uba.ar>.
	(walk_factorization): Return an error code.  All callers changed.