[Tilecache] symbol and label is still broken even though use metabuffer parameter

[Yves Moisan]

> metatile=true/false, not yes/no
> 
> Doesnt know if it makes the difference though

... metatile.lower() in ("true", "yes", "1")

in Layer.py.

'TrUe' would work too :-)

Cheers,

Yves