[Tilecache] Tile seeding hardly slow down after projection

[Dane Springmeyer]

TileCache/mapnik users:

I want to followup that this discussion moved to the mapnik-users list.

It became clear through Damiano's excellent testing that Mapnik had a  
defect and was missing a no-op even when the proj4 literal projection  
strings matched perfectly between <Map srs> and <Layer srs>.

Mapnik also accepts the epsg code, ie '+init=epsg:9000913', but in the  
cases where the proj4 literal was overriding the default srs of epsg: 
4326, a rendering cost was occurring.

Now, thanks to today's patch from Jon Burgess Mapnik is a yet faster  
library:

http://trac.mapnik.org/ticket/156

Dane