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No more hardcoding :)

The expected results is now different due to fixes in babls CIE Lab
in babl commit 0dba0608bd2cfe69453834c1ec87b7a2be13d2dd

This changes the semantics to be line with the expected for CSS/HTML values.
Because the format can only have 256 values per channel, gamma-corrected
is also the only thing which gives sufficient perceptual precision.
Makes previously added unit tests pass.

Warn: changes output of operations using this type of format strings!

This exectuable is useful to others using GEGL,
for instance in test suites.

Added a simplex noise operation implementing the noise function
originally presented by Ken Perlin during a SIGGRAPH 2002 course and
further explained in the paper "Simplex noise demystified" by Stefan

implemented by Dimitris Papavasiliou <dpapavas@gmail.com>

Added a cell noise operation implementing the texture function described in

    Steven Worley. 1996. A cellular texture basis function.
    In Proceedings of the 23rd annual conference on Computer
    graphics and interactive techniques (SIGGRAPH '96).

it produces unstable results in regards to floating point computations.