paraview.simple: add functions for equalizing view sizes

Cory Quammenrequested to merge
cory.quammen/paraview:equalize-views-python into master

Add functions EqualizeViewsHorizontally, EqualizeViewsVertically, and EqualizeViewsBoth. Python traces now record View -> Equalize Views menu item activations as calls to these functions.

Edited by Cory Quammen

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