This function gives the number of tracks in any tracking dataframe. (It's especially helpful because when selecting a subset of tracks within a certain range, sometimes you get tracks in the middle filtered out because the tracks aren't always exactly in numerical order, depending on how you track them)
Cellt racking dataframe, minimally must have one column named Embryo (to specify the embryo number) and one column named Track (to differentiate between different tracks)
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