[Tilecache] Huge dateline gap

[Roger André]

Ok, so now that I've gotten meta-tiling with edge buffering to work, I seem
to be able to better control the missing pixel rows that were causing
horizontal stripes in my Google Map tiles.  Only now I have a huge gap at
the international date line.  I also have a band of missing data at the
extreme South edge of my tiles when I am past Zoom Level 5.  I can probably
live with that, but since my data set is global, I find it interesting that
it's getting cut off, and only on the South side.

Anyone seen this before?
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