Type with enum labels

[grzegorzk]

I extended tests and added from-enum-type.sql:

CREATE TYPE public.feature_type AS ENUM (
        'val ''01''',
        'val ''02''',
        'val ''03''',
        'val ''04''',
        'val ''05''',
        'val ''06'''
);

and also added to-enum-type.sql:

CREATE TYPE public.feature_type AS ENUM (
        'val ''01''',
        'val ''02''',
        'val ''03''',
        'val ''04''',
        'val ''05''',
        'val ''07'''
);

Now tests suite fails.