[Tile-serving] [openstreetmap/mod_tile] mod_tile or render restriction without warning or error after zoom 30 (#118)

[damiendevienne]

I solved issues for deep zooming. 
For information, the fact that zooming after zoom 30 is impossible is due to x and y coordinates of the tiles being larger that 2*10^9 which is not possible if these variables are typed 'int'. Changing from 'int' to 'double' (and solving all related complications) was the solution. 

If some people are interested, a version of the whole modified mod_tile is available on my github. https://github.com/damiendevienne/mod_tile_deepzoom
It compiles, even with mapnik 3.
 

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