Add working draft of a model with wu transactions
Add working draft of a model with wu transactions

Refs #219

agdsn/sipa,agdsn/sipa,agdsn/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,agdsn/sipa,MarauderXtreme/sipa