Have improvements to data-sets go into demo-stable

While the data sets in demo-trunk (coming from the trunk branch) is intended to showcase the maturity of OFBiz to predominantly developers and contributors, the data sets applied to demo-stable can be regarded to highlight the maturity of OFBiz (from release to release) to potential adopters (and influencers other than developers).

Improvements to the data-sets should therefore be merged into the - upcoming - release branch(es) and releases a.s.a.p. after having been committed to the trunk branch.