AlignmentResult.pretty prints the cigartuples to stdout

[matthuska]

The property pretty is useful to get the pretty-printed version of the alignment as a string, but it currently generates noise by printing cigar tuples to stdout. Deleting the following line would resolve this issue:

https://github.com/kcleal/pywfa/blob/734c970eaee4b9a05072e8734174187548f068ba/pywfa/align.pyx#L138

[kcleal]

Thanks! Ive just removed it from the main branch

[kcleal]

Ill leave it open until the release is on pypi