bump-map operation

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I just added a bump-map operation. It is heavily based on the
corresponding gimp code, but modified according to my understanding of
gegl. The fact that the bumpmap is in floating point makes the
resulting "surface" much smoother than the original gimp operation, as
8-bit is too little to get accurate surface normals.

Please let me know your comments about the code and update wiki
"Hacking:Porting filters to GEGL" page. (I would have done it myself
if the maintainer of the wiki would have answered my email requesting
write access.)

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