[Tilesathome] blank tile lookup problem

[spaetz]

I came up with a solution how to store blank tile information more effectively as our blank tile data base is a bit unwieldy.

It is written up on that wiki page:
http://wiki.openstreetmap.org/index.php/Talk:Tiles%40home/The_blank_tile_problem#spaetz_propsal_for_blank_tile_handling

I would be glad about opinions and comments.

spaetz
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