support of "or" in domain

Registered by Ferdinand

get all "current" resources with to_date is null or > today.
queries like this one need a quite complex coding in py.
IMHO would be nice if such constructs can be supported
<field name="domain">[('to_date' or time.strftime('%Y-%m-%d') ,'>=' , time.strftime('%Y-%m-%d') )]</field>

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