Fixes #3266: Incorrect begin/end of alignment for banded alignment #3269
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In case the sequences are sliced by cutting off a prefix of the original seuence due to the band configuration, the relative positions of the sliced sequences was reported inside of the alignment result.
However, this slicing happens only internally and thus the positions reported should correspond to the ones of the original sequences.
We fix this by tracking the offset of the prefix that was cut off and add this to the relative positions during result creation to get the absolute positions.