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This fixes issue #688

Small refactoring of graphviz_draw.

See merge request !42

Update docstring of graphviz_draw.

See merge request !41

Fix GraphWidget.update() crashing when called without vprops or eprops argument.

See merge request !40

Remove unused includes

See merge request !43

The only observable effect should be that calling with output=None and (output_format="xlib" or fork=True) no longer causes an AttributeError.

The effect of setting "output" to None should be more clear now.

This fixes interactive_window() crashing when called with window argument but without vprops or eprops.

This fixes issue #685.

This also exposes the non-descriptor based iteration in the documentation.

This removes a problem with properties named 't' or 'properties' being
accessed via attributes.

Fix issue with a global pen_width given for vertices.