Write a Python program to compute the sum of pairs score of a multiple
alignment with gaps. Your program will take as input a filename containing
a FASTA alignment. Assume the match score is +10, mismatch is +2 and gap
score is -2. When comparing two sequences don't forget to ignore sites
where both are gaps.

For the following example the total score would be

AACGTTGCAC
--CGTT--A-     
AACG----A-    

40 (for sequence 1 and 2) + 40 (for sequence 1 and 3) + 22 (for sequence 
2 and 3) = 102