BUG: Print the histogram calculator for auto threshold filter

The printing of the histogram calculator was missing from the
HistogramThresholdImageFilter, this contains useful
information. Additional has member related to the OtsuThreshold are
now printed too.

Change-Id: Ieecd047fb7dd7da797c0ff54f09a7ce0d1ec5b19
Merge topic 'FixOtsuPrinting'

af7554ad BUG: Print the histogram calculator for auto threshold filter