Check behaviour of standard types

[priefyou]

If another standard type than short_text is used, the generator creates weird code. We must check and fix this. In previous versions of the generator, this worked perfectly...

[Schmidie64]

If type "text" is a reference variable (unique), a size must be specified
This probably also applies to other data types that are unique

[priefyou]

@PeterTHM, this should be handled by a validation rule: attributes of type text and blob are not allowed as unique attributes.