Handle multiple predictions for a same protein.

[ArnaudBelcour]

Some versions of eggnog-mapper (but I do not know which) can return multiple matches for the same protein. This could lead to an error in the script (here).

There are multiple solutions:

• select the match with highest score, by adding the following line (just after this line):

  annotation_data = annotation_data.sort_values('score', ascending=True).drop_duplicates('query').sort_index()

• merge the annotation of the different matches, by adding the following line (just after this line):

  annotation_data = annotation_data.groupby(['query']).agg(lambda col: ','.join(col)).reset_index()