pairwise_align parameter defaults are set for paste1

[vineetbansal]

The parameter defaults for pairwise_align are set to the defaults that were used in PASTE1. The two that I know of are dissimilarity (kl for paste1, should be glmpca for paste2), and norm (False for paste, True` for paste2). These are likely the only two.

These defaults must have been set for some practical reason based on the performance of the algorithm, so its best not to burden the user to change these depending on the value of s.