The `plot` method returns the wrong xlabel if run on a folded light curve. about lightkurve HOT 6 CLOSED

Thinking out loud: this could be a job for the meta attribute, i.e. the fold() method could set lc.meta['is_folded'] = True. The plot method could look for that, and if it's not set, go with the default.

If the user specified the label as an argument to plot, that would get priority over anything, of course.

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I think that it might be better to have some description attribute for what's held in flux, flux_err and time. Then when the user prints them it displays that description? The description can update if you run the fold method or flatten method.

e.g.
lc = tpf.to_lightcurve()

flux: 'Flux in counts [e-s-1]

lc = lc.normalize()

flux: 'Normalized Flux'

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Interesting. I wonder if we want to keep track of flux_label and flux_units as attributes or using the meta dictionary.

Related note: right now we don't support astropy Quantity at all (if flux is a Quantity is converted to a simple numpy array in the constructor of LightCurve).

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This can be fixed by the user if they pass the xlabel keyword...but we're not doing it. And it's in all our docs and tutorials and gifs.

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I've proposed a fix in #64.

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#64 has been merged, meaning this issue should be fixed now!

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