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Predicate pce_define_type/2
 pce_define_type(+Name, +Type) is det
Create a type alias name, so we can write more readable code. Typical examples make aliases for `name' (name cannot be subclassed), alias for numeric and name-sets. Here are some examples: 
:- pce_define_type(rdf_resource, name).
:- pce_define_type(weekday,     {sunday,monday,tuesday,wednesday,
                                 thursday,friday,saturday}).
:- pce_define_type(natural,     '1..').
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