[Tilesathome] new Tiles at home client behaviour. Plus Oceantiles.dat change!

[Dirk-Lüder Kreie]

This needs some amendments from the other devs, because I can only speak
for the changes I made or participated in.

* New fallback API
* New fallback logic in case the client gets no data
* make oceantiles stuff an external, so it's easier to keep in sync with
multiple client branches.
* slightly improved messaging for better logging.

-- 

Dirk-Lüder "Deelkar" Kreie
Bremen - 53.0952°N 8.8652°E


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