FIX: Enforce sub-matrix shape to all-zero columns being dropped #104
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An undocumented change in Scipy 1.13 caused the tests to fail because a column in a sub-matrix contained all zero values.
This is fixed by setting the shape during the matrix creation.
The random seed had to be changed because one of the randomly generated matrices with float precision had two entries with identical values which caused resulted in different ordering of the indices.