ESC-154 ESC-155 Viewer metrics fixes for min/max merged values, floating timestamps.

The min/max response time calculations needed to be sensitive to the response
counts to know if their was actual data.  Failure to do so introduced a
gratuitous min/max test against zero values which tended to corrupt the
mins.  Unit tests added to test for this condition.  Finished conversion
of times to floating point seconds.  Removed two logging events used to
debug the cross-thread messaging.  Looks like a code completion point.

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