Changes in version 1.6.0                        

    o   Support the SVT_SparseMatrix version 1 class definition in
	saveObject. However, note that this was not implemented for the
	soft-deprecated writeSparseMatrix, which now errors if such
	objects are passed in.

    o   Added a extract_sparse_array() method for the WrapperArraySeed
	class, for some future-proofing when the seeds eventually make
	the switch.

    o   Bugfix for integer overflow when saving large sparse matrices
	in saveObject().

    o   Open all HDF5 files in read-only mode for readObject() dispatch
	functions, to avoid permission-related issues.