[Nel] shapes pre-loading

[Francois DUSSAUGE]

hi all,

I try to pre-load some shapes in a cache to accelerate their display during the 
execution.
I set the size of the cache "default" of the driver's shapebank to 1Mo (with he 
method "setShapeCacheSize"), but nothing happens and the size of the cache 
always stays at zero. 
So when I use the method "preLoadShapesFromDirectory", no shape is put in the 
cache.
I have no error message.

Maybe someone can tell me if I forgot to do something? 

thanks a lot