Bug 6068: RDF output from MRM is not correctly identifying agg series slots [2]
Bug Number: 6068
Release notes (y/n): no (not yet)
For Release Nums: 7.3, maybe 7.2.1

When an AggSeriesSlot is created, its slot columns are given default labels.
The first slot column (which is the AggSeriesSlot itself, being a SeriesSlot 
subclass) is assigned a default column label which is the SAME AS the 
AggSeriesSlot's initial name.  The subsequent slot columns are given that 
name with the ordinal number appended ("AggSeries2", "AggSeries3", etc.).

This commit omits the first columns AggSeriesSlot column label if it is 
the SAME AS the overall slot's name (in the generated RDF file):

  OLD:  slot_name: AggSeries.AggSeries
  NEW: slot_name: AggSeries

The bool parameter was added to this new Sim/RootColRef method:

  QString RootColRef::getSlotLocalNameWithColLabel (
     bool omitRedundantColZeroLabel /*=true*/) const;

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