[Tilecache] Mapserver AGG/PNG paletted image distorted when using metatile due to limitation of PIL - works fine with pil-117-fastpng

[Ivan Mincik]

Hi, all improvements for paletted PNGs (great work be Oliver
Tonnhofer) are now merged in development version of PIL.  As far as I
know, there is no better way how to work with paletted PNGs, than to
use latest dev PIL. To be safe, You can always build PIL-dev localy,
without installing and set python path for TileCache to use it.

Ivan