add condition to BSW in case of reversing #361
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add condition to BSW in case of reversing
: It calculated h from beg to end.
Because of the applying band, sometimes beg can grow bigger than end.
Then skip i and run i+1 with the e-h value of i-1, not i's. It could cause misalignment.
So, I added break condition.
example)
w = 81, qlen = 72
if i = 165, i-w = 84 > beg = 84
end = 72