[views/templates] provide a modal main template (closes #3274672) The current NonTemplatableViewTemplate may seem to provide the desired feature if a '__notemplate' is provided in the form, unfortunately, it: * wraps the view in a spurious div * calls view.set_stream(), which has the effect of wiping any js/css resource recorded until then by the view, leading to hard-to-track missing resources symptoms

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if not rql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',

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           ask_confirm=False):

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    rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',

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        ask_confirm=False)