COMP: RankHistogram shouldn't have any virtual method
COMP: RankHistogram shouldn't have any virtual method

This will avoid a warning about non virtual destructor available.

Change-Id: I75268c9ae24683448606188d48cd2154dcfcbe0a

jcfr/ITK,fuentesdt/InsightToolkit-dev,ajjl/ITK,PlutoniumHeart/ITK,zachary-williamson/ITK,atsnyder/ITK,spinicist/ITK,hjmjohnson/ITK,PlutoniumHeart/ITK,paulnovo/ITK,GEHC-Surgery/ITK,Kitware/ITK,GEHC-Surgery/ITK,hendradarwin/ITK,blowekamp/ITK,rhgong/itk-with-dom,InsightSoftwareConsortium/ITK,CapeDrew/DCMTK-ITK,paulnovo/ITK,LucasGandel/ITK,malaterre/ITK,BlueBrain/ITK,CapeDrew/DITK,hinerm/ITK,spinicist/ITK,thewtex/ITK,stnava/ITK,fuentesdt/InsightToolkit-dev,vfonov/ITK,msmolens/ITK,fuentesdt/InsightToolkit-dev,malaterre/ITK,zachary-williamson/ITK,fedral/ITK,biotrump/ITK,GEHC-Surgery/ITK,rhgong/itk-with-dom,BlueBrain/ITK,rhgong/itk-with-dom,itkvideo/ITK,thewtex/ITK,jcfr/ITK,LucHermitte/ITK,msmolens/ITK,itkvideo/ITK,paulnovo/ITK,wkjeong/ITK,fuentesdt/InsightToolkit-dev,CapeDrew/DCMTK-ITK,paulnovo/ITK,stnava/ITK,BRAINSia/ITK,vfonov/ITK,vfonov/ITK,LucHermitte/ITK,PlutoniumHeart/ITK,Kitware/ITK,spinicist/ITK,atsnyder/ITK,fuentesdt/InsightToolkit-dev,fedral/ITK,PlutoniumHeart/ITK,cpatrick/ITK-RemoteIO,eile/ITK,hjmjohnson/ITK,BRAINSia/ITK,stnava/ITK,hjmjohnson/ITK,rhgong/itk-with-dom,stnava/ITK,zachary-williamson/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,eile/ITK,PlutoniumHeart/ITK,BlueBrain/ITK,jcfr/ITK,LucHermitte/ITK,fbudin69500/ITK,biotrump/ITK,itkvideo/ITK,richardbeare/ITK,hjmjohnson/ITK,atsnyder/ITK,CapeDrew/DITK,CapeDrew/DCMTK-ITK,eile/ITK,cpatrick/ITK-RemoteIO,eile/ITK,CapeDrew/DCMTK-ITK,stnava/ITK,biotrump/ITK,heimdali/ITK,PlutoniumHeart/ITK,vfonov/ITK,jmerkow/ITK,ajjl/ITK,richardbeare/ITK,atsnyder/ITK,daviddoria/itkHoughTransform,CapeDrew/DITK,jcfr/ITK,thewtex/ITK,eile/ITK,zachary-williamson/ITK,fbudin69500/ITK,atsnyder/ITK,fedral/ITK,wkjeong/ITK,wkjeong/ITK,richardbeare/ITK,wkjeong/ITK,blowekamp/ITK,GEHC-Surgery/ITK,CapeDrew/DCMTK-ITK,msmolens/ITK,hendradarwin/ITK,jmerkow/ITK,eile/ITK,richardbeare/ITK,BlueBrain/ITK,fbudin69500/ITK,ajjl/ITK,hendradarwin/ITK,heimdali/ITK,BlueBrain/ITK,CapeDrew/DCMTK-ITK,spinicist/ITK,itkvideo/ITK,itkvideo/ITK,ajjl/ITK,malaterre/ITK,GEHC-Surgery/ITK,BlueBrain/ITK,BRAINSia/ITK,hinerm/ITK,blowekamp/ITK,biotrump/ITK,CapeDrew/DITK,daviddoria/itkHoughTransform,BRAINSia/ITK,malaterre/ITK,heimdali/ITK,LucasGandel/ITK,jmerkow/ITK,biotrump/ITK,ajjl/ITK,zachary-williamson/ITK,zachary-williamson/ITK,daviddoria/itkHoughTransform,GEHC-Surgery/ITK,InsightSoftwareConsortium/ITK,PlutoniumHeart/ITK,fbudin69500/ITK,Kitware/ITK,jcfr/ITK,paulnovo/ITK,rhgong/itk-with-dom,heimdali/ITK,paulnovo/ITK,stnava/ITK,fedral/ITK,LucasGandel/ITK,hendradarwin/ITK,heimdali/ITK,LucHermitte/ITK,spinicist/ITK,msmolens/ITK,biotrump/ITK,blowekamp/ITK,itkvideo/ITK,fuentesdt/InsightToolkit-dev,vfonov/ITK,cpatrick/ITK-RemoteIO,GEHC-Surgery/ITK,biotrump/ITK,LucHermitte/ITK,eile/ITK,vfonov/ITK,richardbeare/ITK,jmerkow/ITK,CapeDrew/DITK,rhgong/itk-with-dom,hinerm/ITK,BlueBrain/ITK,biotrump/ITK,msmolens/ITK,atsnyder/ITK,thewtex/ITK,ajjl/ITK,stnava/ITK,Kitware/ITK,daviddoria/itkHoughTransform,fedral/ITK,zachary-williamson/ITK,paulnovo/ITK,hendradarwin/ITK,BRAINSia/ITK,hjmjohnson/ITK,spinicist/ITK,fbudin69500/ITK,vfonov/ITK,malaterre/ITK,malaterre/ITK,ajjl/ITK,cpatrick/ITK-RemoteIO,atsnyder/ITK,spinicist/ITK,cpatrick/ITK-RemoteIO,hinerm/ITK,rhgong/itk-with-dom,fbudin69500/ITK,stnava/ITK,daviddoria/itkHoughTransform,jmerkow/ITK,LucasGandel/ITK,heimdali/ITK,CapeDrew/DITK,eile/ITK,blowekamp/ITK,LucasGandel/ITK,malaterre/ITK,wkjeong/ITK,CapeDrew/DCMTK-ITK,itkvideo/ITK,Kitware/ITK,wkjeong/ITK,CapeDrew/DITK,CapeDrew/DITK,hinerm/ITK,LucHermitte/ITK,daviddoria/itkHoughTransform,richardbeare/ITK,thewtex/ITK,vfonov/ITK,fbudin69500/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,daviddoria/itkHoughTransform,CapeDrew/DCMTK-ITK,ajjl/ITK,fuentesdt/InsightToolkit-dev,msmolens/ITK,jcfr/ITK,fedral/ITK,hinerm/ITK,heimdali/ITK,cpatrick/ITK-RemoteIO,Kitware/ITK,LucasGandel/ITK,BlueBrain/ITK,zachary-williamson/ITK,hinerm/ITK,spinicist/ITK,wkjeong/ITK,InsightSoftwareConsortium/ITK,hinerm/ITK,fuentesdt/InsightToolkit-dev,eile/ITK,CapeDrew/DITK,InsightSoftwareConsortium/ITK,thewtex/ITK,BRAINSia/ITK,spinicist/ITK,jmerkow/ITK,Kitware/ITK,jmerkow/ITK,msmolens/ITK,hendradarwin/ITK,GEHC-Surgery/ITK,CapeDrew/DCMTK-ITK,fbudin69500/ITK,wkjeong/ITK,LucHermitte/ITK,zachary-williamson/ITK,richardbeare/ITK,rhgong/itk-with-dom,stnava/ITK,cpatrick/ITK-RemoteIO,fedral/ITK,fedral/ITK,hjmjohnson/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,paulnovo/ITK,blowekamp/ITK,hendradarwin/ITK,blowekamp/ITK,atsnyder/ITK,malaterre/ITK,cpatrick/ITK-RemoteIO,PlutoniumHeart/ITK,malaterre/ITK,hinerm/ITK,jmerkow/ITK,blowekamp/ITK,BRAINSia/ITK,atsnyder/ITK,fuentesdt/InsightToolkit-dev,jcfr/ITK,msmolens/ITK,LucHermitte/ITK,LucasGandel/ITK,daviddoria/itkHoughTransform,heimdali/ITK,LucasGandel/ITK,itkvideo/ITK,daviddoria/itkHoughTransform,itkvideo/ITK,jcfr/ITK,hendradarwin/ITK