Call by reference in ab13bd

State space matrices A,B,C,D are changed after call.

```python
    out = _wrapper.ab13bd(dico, jobn, n, m, p, A, B, C, D, tol)
```

Fix, shallow copy
```python
    a = A.copy()
    b = B.copy()
    c = C.copy()
    d = D.copy()

    out = _wrapper.ab13bd(dico, jobn, n, m, p, a, b, c, d, tol)
```