Rewrote BicubicInterpolation to be much faster, by using a pixel_accessor  to get at the 16 underlying pixels, using doubles rather than floats to avoid  unnecessary floating-point conversions, and breaking the computation up in a  way that's easier for the compiler to optimize.  Way faster (at least for me).
Rewrote BicubicInterpolation to be much faster, by using a pixel_accessor 
to get at the 16 underlying pixels, using doubles rather than floats to avoid 
unnecessary floating-point conversions, and breaking the computation up in a 
way that's easier for the compiler to optimize.  Way faster (at least for me).


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