RfD: Support for layer specific resources

[Martin Schulze]

Frank Koormann wrote:
> Based on the assumption that rendering is the most expensive process step
> (at least for local layers) I had in mind to cache each rendered layer 
> image separately. Would speed up Thuban significantly as long as the map 
> extend is constant, but I haven't thought much about memory requirements 
> so far ...

Storing the images in $config.thubandir + "/cache/" would help a lot
as well.  No need to store loads of images only in the RAM.

Regards,

	Joey

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