Product-only:

Product-only:
- data output by a p:dataTable with pagination, filtering and sorting cannot
  come from a request-scoped bean as each AJAX request will reset the
  filteredValue-referenced bean property to null which leads to an empty table.
- better is to have a separate backing bean on view-scoped which holds both
  lists, the full ("all") list and filtered list (which are the items that have
  passed the filter).
- also had to update converters and validators

Signed-off-by: Roland Häder <roland@mxchange.org>