[html-formfu] Model::DBIC: Support multi_value fields for has_one relationships

[Moritz Onken]

Hi Carl,

I attached a patch which adds support for multi_value fields to select  
values of a has_one or might_have relationship. You can use now a  
Select box to choose oan item of the has_one relationship.

The current implementation uses transactions to make sure, that the  
new items exists and if not (rollback), that the current status of the  
relationship is preserved.

I think there is no transaction code in Model::DBIC yet. So I'm not  
sure if you like it that way.

Works both for create, update and default_values.

Tests are attached as well.

cheers,

moritz

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