Improve Interpolate 2D Scattered performance with interpolant

[D*]

Interpolate 2D Scattered uses triangulation which is fairly CPU intensive.

The most difficult part, (and the part that most of the CPU time is spent on) is defining the triangles.  Once the triangles are specified, the interpolation is fairly quick (and could possibly be done on an FPGA).  This is the same idea as using the scatteredInterpolant class in Matlab (see : http://www.mathworks.com/help/matlab/math/interpolating-scattered-data.html#bsow6g6-1 )

The Interpolate 2D Scattered function needs to be broken up into two pieces just like Spline Interpolant, Spline Interpolate are. 

[altenbach]

Agreed.

Another possible solution would be to internally cache the output of intermediary functions if the inputs don't change, e.g. using a technique described here. Certain things could also be optimized directly. For example it seems that virtually all subVIs used inside the scattered interpolation have debugging enabled. Why???

[Darren]

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