Created a new method which output an ndarray of itself (with the dates set to 0 so that the indices remain the same)
Created two functions:

- find_cross_overs finds where the 24 hour average crosses over with a short moving average.
- find_equal_temps does the same as find_cross_overs, except that for each cross_over follows the data until the short moving average equals the temperature from the last cross over (with the up and down average possibly overlapping).