Cse587autils

Key Points

- Adjusting the `SequenceModel.__init__()` to explicitly check for
`None` to avoid isues with checking numpy arrays for truthiness

Key points

- Adding `SequenceModel.set_site_base_prob()` method`

Key points

- removing motif_length property, adding motif_length function

Key points

- Adding np.ndarray as an acceptable datatype for `background_base_probs`

Key Points

- Adding SequenceObjects. This adds the SequenceModel object for the Site labs
- Adds `int` to the accepted datatype for check_probabilities