Created the lib.sequence_alignment.align_protein module for the sequence alignment of proteins.
This general module currently implements the align_pairwise() function for the pairwise alignment of
protein sequences. It provides the infrastructure for specifying gap starting and extension
penalties, choosing the alignment algorithm (currently only the Needleman-Wunsch sequence alignment
algorithm as 'NW70'), and choosing the substitution matrix (currently only BLOSUM62). The function
provides lots of printouts for user feedback.
