Pairwise string alignment in Python

My contribution will be:

• Code cleanup
• Support of arbitrary alphabets of input strings (no similarity matrix)
• Support of both variants:
  1. Smith-Waterman = local alignment
  2. Needleman-Wunsch = global alignment

Original Smith-Waterman implementation in Python was forked from http://narnia.cs.ttu.edu/drupal/node/104 by Forrest Sheng Bao http://fsbao.net a free software licensed under GNU General Public License (GPL)

A copy of GPL version 3 has been placed into the file LICENSE.