New operators to do trending

[sbouchex]

A nice to have would be to have some operators to estimate a value based on previous ones by using different algorithms (Moving average, Weighted moving average, least-square or Moving median)

see https://en.wikipedia.org/wiki/Moving_average
see https://en.wikipedia.org/wiki/Linear_trend_estimation

Operators can be:
linear: trend(serie, nb points)
least square: lstrend(serie, nb points)

[sslupsky]

Moving median would be a nice one to have. Presently, to apply a median filter requires that you downsample your data.

[stale]

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