[Dev] Almost fixed a bug related to issue #8: the cities of multi-city airports were under-valued for PageRank.
[Dev] Almost fixed a bug related to issue #8: the cities of multi-city airports were under-valued for PageRank.

trep/opentrep,trep/opentrep,trep/opentrep,trep/opentrep,trep/opentrep,trep/opentrep