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* Do not crash when overlay tile data is not a valid image
* Correctly generate metadata for zoom levels
* Add support for tms mbtiles
* Correct tile box calculation for case when floating point value is an integer
* Correctly generate metadata for zoom levels
* Use the full path to construct the cache directory, as otherwise different
tiles sets on the same server are considered to be the same one
* Added a name metadata to prevent Maptiler crash