Finds the most frequent base in each column for all marked
species. Than the number of all sequences with this base are
divided by:
a: the number of all marked sequences, if not ignoring gaps
b: the number of bases in this column, if ignoring gaps
The resulting percentage is divided by ten and the second last
digit taken:
0% - 25% will never occur
25% - 29% -> '2'
30% - 39% -> '3'
...
90% - 99% -> '9'
100% -> '0'
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