ENH: Changed histogram-view trackerText() and drawRubberBand() to read visible curves only (ess RGB selector combo-box).

ENH: Added tooltips to zoom 1:1 and zoom extent of histogram; Changed tracekrText() format of histogram.

ENH: Fixed histogram-view grayscale problem (bad refresh of RGB curves when switching from saved grayscale-mode image to RGB color-setup).

ENH: Use of Scott's formula to compute number of bins of histogram; Cloned otbStreamingHistogramVectorImageFilter in order to upgrade interface (number of bins per band).

ENH: Fixed crash when ColorSetupController::ClearWidget(). Missing QCOMBOBOX_NAMES[] entry for RGBW_CHANNEL_WHITE.

ENH: Implemented HistogramPlotPicker::drawRubberBand() and ::trackerText() methods to pick (by dichotomy) RGB frequency values of histogram.

ENH: Docked histogram-widget; Added AbstractModelController::ClearWidget() when dataset selection is cleared.