xor.m: Extend to handle more than 2 arguments as a reduction operator. * xor.m: Redo docstring. Create internal function __xor__ to perform 2 argument xor. Loop over extra arguments in varargin, calling __xor__ as necessary. Update input validation and BIST tests. * data.cc (Fand, For, Fnot): Improve docstrings of related logical operations.

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