Comment 20 for bug 1760502

Many thanks for the patience,
Have tested it algorithm works fine now. AI now is really only building fishermens huts where the roads are blocking the fish. This we should be able to cope for with the threshold. from analysing the logs I'd like to propose a threshhold of 15 which is more the less two filed with default amount.
Together with the change you could remove the Debug messages and superfluous comments so we can merge the branch