[Tilesathome] Take and Release feature

[spaetz]

> > Can we imagine a kind of option for tilesGen.pl or something else to 
> > avoid process an osm data file larger than X bytes?
> > In this case, the script releases the request so another client can take it
> 
> Afaik there are bits where e.g. client gets no data and already reports 
> "putting job back to server".

Could be done this way, but is the wrong approach IMHO. the server should not hand out such complex tasks in the first place. we don't want the complex .osm files downloaded by 10 clients before one decides to take it. the API is our bottleneck anyway.

the client should announce a maximum complexity when taking a job and the server would hand out an easy one.

spaetz