[Tilesathome] t at h Lowzoom does sea now properly

[spaetz]

> - Rather than mercator coordinates we use lat/lon. High low zooms this will skew things (I don't know by how much). Somebody will have to write a preprocessor to fix this. (not me)
Still not solved

> - Sea tiles are not rendered as such. (neither are coastlines it seems). I have no clue about that sea lookup works during the render phase, so I can't promise a quick fix here. Deelkar, or Frederik might know that stuff better.
Yea!!! Frederik Ramm fixed the assumption that we always use z12 tiles just before he left for holiday. It works nicely now!

> my next steps: 
> -Develop stylesheets further to be useful.
> -Look into sea tiles
Done :-)

> -Make request queueing be smart enough to see if a low-zoom renderer or a high-zoom renderer asks for work and enable low zoom requests.
Renderer clients announce now the levels they render to the server, so it can hand out low zoom requests to those that render low zoom and high zoom requests to the rest (server side not implemented yet).

> -Once mature enough, probably start rendering z10 and z11 directly and stitch lower zoom levels together from z10 for now.
Give it a week more or so then we'll talk about this again.

Some nice z10 and z11 tiles around Margate can be seen here (there is sea around it now):
http://informationfreeway.org/?lat=51.24763044632959&lon=1.3643643285245604&zoom=10&layers=0000FB00
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