Integrate pandas tutorials

[janerigby]

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@kelle asked me to post an issue, that I've been trying to figure out how to better integrate my "astronomy with pandas" tutorials(https://github.com/janerigby/astro-pandas-tutorials) into the astropy tutorials.

The "Why Pandas" tutorial especially might make sense for integration into the astropy tutorials.

There's a new draft tutorial , https://github.com/janerigby/astro-pandas-tutorials/blob/master/Tables%20-%20Pandas%20and%20Astropy.ipynb , which eventually could show the relative strengths of astropy.tables and pandas for different applications. At present, it shows the places where astropy tables and pandas don't play well together. I'm working on the first issue: astropy.tables.to_pandas() throws an error when trying to convert a multi-dimensional table to pandas, instead of better behavior which would be to drop the offending columns, or expand them into multiple columns. The second issue is about big or little-endian, and I have no idea how to deal with it.

[kelle]

Draft colab tutorial (started by Vicky Scowcroft) is here: https://colab.research.google.com/drive/1nYBq3XDGbKj0zW8hlaMubzY16hFx3DHy

[kelle]

relevant material: http://www.astrowing.eu/data-science/astropy-tables-vs-pandas-dataframes

[kelle]

Looping @taldcroft into this issue. Tom, maybe the link I posted above is the one you also found?