Finding local minima and maxima of a graph

[Bryan McCormick]

Thanks to everyone who tossed in their thoughts and code samples. 
Francois, yes, it is a variation I suppose of wavelets, or a filtered 
wave. It makes perfect sense. The degree of variation is something that 
needs to be added as a function param so that significance can be 
selectable on a percentage basis. And sure, rate of change would be a 
good way to do that.