New temporal interpolation methods
It would be good to add some more elaborate methods, like sinusoidal regression or spline interpolation.
See for example * http://www.originlab.com/www/helponline/origin/en/UserGuide/Interpolate_Extrapolate_Y_from_X.html * http://exnumerus.blogspot.co.uk/2010/04/how-to-fit-sine-wave-example-in-python.html * http://www.geogebra.org/forum/viewtopic.php?f=22&t=5789