Stokes.from_matrix should check the the matrix is a colum

When a row vector is passed to Stokes.from_matrix no error is raised, but then other methods such as normalize and check fail in unclear ways.

Example code:

j1 = Stokes()
j1.from_matrix([1, 1, 0, 0]) # Should raise a clear error
j1.check()

Error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/media/work/software/peg/.venv/lib/python3.8/site-packages/py_pol/stokes.py", line 293, in check
    s0 = np.asscalar(self.M[0])
  File "<__array_function__ internals>", line 5, in asscalar
  File "/media/work/software/peg/.venv/lib/python3.8/site-packages/numpy/lib/type_check.py", line 575, in asscalar
    return a.item()
ValueError: can only convert an array of size 1 to a Python scalar

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