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Introduce XML file publications source widget

Closes #72

See merge request !10

Resolve "Create an unAPI element for wizard"

Closes #71

See merge request !9

org.springframework.orm.jpa.JpaSystemException: null index column for collection: org.gesis.dda.wizard.domain.Element.options; nested exception is org.hibernate.HibernateException: null index column for collection: org.gesis.dda.wizard.domain.Element.options

https://stackoverflow.com/questions/2956171/jpa-2-0-ordercolumn-annotation-in-hibernate-3-5/3480336#3480336
http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-hibspec-collection-extratype-indexbidir
http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/collections.html#collections-indexed
https://hibernate.atlassian.net/browse/HHH-5390