Layered -- Option for matrixFactorization

Makes matrixFactorization use the "layered" algorithm, which works for any MCM module, but returns something non-minimal if the module is not a "high syzygy" in a suitable sense. Default is "true". Note that when the module is a high syzygy, Layered=> false is much faster.

Functions with optional argument named Layered:

• matrixFactorization(...,Layered=>...) -- see matrixFactorization -- Maps in a higher codimension matrix factorization