histbins: Automatic bin determination: Freedman & Diaconis formula
histbins: Automatic bin determination: Freedman & Diaconis formula

Signed-off-by: Jean-Yves Tinevez <e56a6ee37544ca2467315a0f3163c8180fa84354@pasteur.fr>

tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab