Fix tight layout in pyplot.py #4851
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This fixes issue #2654.
In figure.py, there is a figure.set_tight_layout function (to be used by frontend code) and a figure.tight_layout function (called as part of figure.draw).
Calling figure.tight_layout directly breaks the separation between frontend and backend, causing issue #2654.
In pyplot.py, there is a function tight_layout which calls figure.tight_layout. The tight_layout function in pyplot.py is frontend code, and should call figure.set_tight_layout instead.
This pull request ensures that tight_layout in pyplot.py calls figure.set_tight_layout, and also fixes the example scripts where figure.tight_layout was called instead of figure.set_tight_layout.
We should consider renaming set_tight_layout in figure.py to tight_layout to be consistent with tight_layout in pyplot.py (this is currently not included in this pull request).