BACM — ValueProposition aggregates ValueProposition - owns vs aggregates

The specification has this as an aggregates association but the quantification suggests ownership. Resolve whether owns or aggregates and change owned end quantification to match.

Merge this issue with BACM-83

The proposal to resolve BACM-83 is able to address this issue. A convincing argument to restrict the associations between ValuePropositions to being only that of owning was not found. The default model will allow generalizes, owns and aggregates at the discretion of the business architecture modeler.