Check both upper and lower corners when finding tilesize #269
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Summary
At the moment to get the tile size, the tile merger looks at the size of the tile found in the bottom left corner of the image. This is problematic if this tile is missing.
This PR changes it so that it tries the lower left corner, then if its not found, tries the upper right corner and then if its not found, raises an error.
Addresses #239.
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