Added a function 'spline' which should be a more general replacement functiion for the other 'logSpline' methods.  Added 'sampleInverse' to evenly sample a function in the y-parameter.
Added a function 'spline' which should be a more general replacement functiion for the other 'logSpline' methods.  Added 'sampleInverse' to evenly sample a function in the y-parameter.

lzkelley/zcode,lzkelley/zcode