Idea is to provide possibility to select active organization party id, which then could be used:
1) to provide default in different components (e.g. in creating invoices, payments, accounting transactions, etc.);
2) in implementation of
OFBIZ-118, i.e. to show or hide data based on the active organization;
3) to improve current Accounting/Companies/Admin so that organizationPartyId is remembered throughout the session (if not changed).