PROV-434 No more label-less set items

The goal is to get rid of a ugly hack in getRelatedItems(). It's also
nicer to enforce labels across the board.
PROV-434 Remove two year old hack
PROV-434 Added test
PROV-434 Catch caProcessTemplateForIDs failure (was causing PHP error)
Merge branch 'dev/fixSetItemLabels' into develop

* dev/fixSetItemLabels:
  PROV-434 Catch caProcessTemplateForIDs failure (was causing PHP error)
  PROV-434 Added test
  PROV-434 Remove two year old hack
  PROV-434 No more label-less set items