Organize arguments of functions and apply colorblind_safe option

[tamakoshi2001]

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Description
This is part of the Google Summer of Code project. My contribution consists of two parts.
One part is organizing arguments of functions in visualization.py. This change helps users to set arguments without referencing documents frequently.
For example, hinton does not have figsize, but other functions such as plot_energy_level do. Also, the order of the arguments varies from function to function, so the user had to see the official document.
I addressed these issues by making the following modifications
First, arguments that many functions should have in common, such as fig and ax, are now keyword arguments.
Second, the order of the arguments was aligned as required arguments, function-specific ones, and common ones, making it easier for the user to remember and use.

# before
hinton(rho, xlabels=None, ylabels=None, title=None, 
       ax=None, cmap=None, label_top=True, color_style='scaled')
# after
hinton(rho, x_basis=None, y_basis=None, color_style="scaled",
       label_top=True, *, cmap=None, colorbar=True, fig=None, ax=None)

The other is applying colorblind_safe to them. QuTiP has colorblind_safe as a setting option, but most functions did not change their color corresponding to colorblind_safe. Now, they change their plot colors when you change the colorblind_safe option and you can change color if you do not like the default color.
For example, when quite.settings.colorblind_safe=False, a plot by plot_spin_distribution is the left plot. On the other hand, when quite.settings.colorblind_safe=False, it outputs the right plot in the different colormap (cividis). This is perceptually uniform. Of course, you can change the colormap as you like.

[coveralls]

coverage: 78.18% (+0.07%) from 78.106% when pulling e98bb7b on tamakoshi2001:GSoC_project6_week1 into f66b8f2 on qutip:master.

[tamakoshi2001]

I combined spin distribution functions for 2d and 3d into one. Those two will be deleted.

[tamakoshi2001]

I added new_hinton. The arguments in new_hinton are more organized than those in hinton. It will replace hinton.

[tamakoshi2001]

@Ericgig Hi. I changed hinton, matrix_histogram_complex, and plot_energy_level this weekend. Could you let me know if the selection of arguments is good? Thank you. Here is a sample use.
https://drive.google.com/file/d/1LSNLWW2FBhX4PeMXJTxSN6Qgb-G6_TXn/view?usp=sharing

[tamakoshi2001]

Hi. I worked on
hinton,

sphereplot,
matrix_histogram_complex
plot_energy_levels,
plot_fock_distribution,
plot_wigner,
plot_expectation_values,
plot_spin_distribution (cmap will be changed)
I would like you to see if they are ok. Here is the example use; https://drive.google.com/file/d/1rGcTEWz2c9-wRnQSWSVyt5SfVTVaTkvl/view?usp=sharing.

[tamakoshi2001]

I will work on
plot_wigner_sphere,
matrix_histogram,
inner functions,
deprecated functions (e.g. energy level diagram),
cmap on qubism and schmidt,
documents

[tamakoshi2001]

Other than doing the changes you suggested, I updated the description and deleted all deprecated functions.

[tamakoshi2001]

@Ericgig Hi. I have some questions about your suggestions above. Could you answer them?

[tamakoshi2001]

@Ericgig Hi. I made a few changes.

[tamakoshi2001]

@Ericgig Could you review the code?

[Ericgig]

Why is there a try, except clause here?

[tamakoshi2001]

That code makes bra and ket like labels by using dimensions of Qobj. If it does not exist, when users want to see superoperators, the code outputs an error because of their dimensions. I believe showing plot is more important than adding labels.
superoperator.pdf

[Ericgig]

Dimensions exist for all Qobj including superoperators.
If _default_cb_labels does not support superoperator, we could add that support or use

Suggested change

	try:
	x_basis, y_basis = _default_cb_labels(x_basis, y_basis, M)
	except Exception:
	pass
	if not M.issuper:
	x_basis, y_basis = _default_cb_labels(x_basis, y_basis, M)

to make clear this is a special case.

[tamakoshi2001]

Hi. I do not know that dimensions exist for all Qobj. I used the shape of Qobj and the code should work for all Qobj now. I deleted _default_cb_labels because this is made to follow pep8 and we no longer need it.

[Ericgig]

Look good, I will play with it a little more tomorrow before finishing the review.

[Ericgig]

Look fine, thank you