ENH: Bump release branch CMakeLists.txt version to 4.2.1.
ENH: Bump release branch CMakeLists.txt version to 4.2.1.

Change-Id: Ie160616486f1c8526372c85b50f89ede59a4d370

eile/ITK,malaterre/ITK,BRAINSia/ITK,vfonov/ITK,msmolens/ITK,jmerkow/ITK,InsightSoftwareConsortium/ITK,atsnyder/ITK,jmerkow/ITK,eile/ITK,zachary-williamson/ITK,LucHermitte/ITK,biotrump/ITK,richardbeare/ITK,hinerm/ITK,PlutoniumHeart/ITK,msmolens/ITK,malaterre/ITK,biotrump/ITK,stnava/ITK,fbudin69500/ITK,hendradarwin/ITK,fuentesdt/InsightToolkit-dev,hendradarwin/ITK,eile/ITK,LucHermitte/ITK,ajjl/ITK,heimdali/ITK,hendradarwin/ITK,hjmjohnson/ITK,jcfr/ITK,atsnyder/ITK,hinerm/ITK,eile/ITK,msmolens/ITK,fbudin69500/ITK,fuentesdt/InsightToolkit-dev,Kitware/ITK,LucHermitte/ITK,PlutoniumHeart/ITK,blowekamp/ITK,LucHermitte/ITK,eile/ITK,ajjl/ITK,thewtex/ITK,fuentesdt/InsightToolkit-dev,hendradarwin/ITK,atsnyder/ITK,zachary-williamson/ITK,LucasGandel/ITK,heimdali/ITK,biotrump/ITK,InsightSoftwareConsortium/ITK,jcfr/ITK,hinerm/ITK,stnava/ITK,msmolens/ITK,GEHC-Surgery/ITK,BlueBrain/ITK,BlueBrain/ITK,jcfr/ITK,heimdali/ITK,stnava/ITK,BlueBrain/ITK,zachary-williamson/ITK,BlueBrain/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,atsnyder/ITK,hendradarwin/ITK,BRAINSia/ITK,fuentesdt/InsightToolkit-dev,blowekamp/ITK,msmolens/ITK,fedral/ITK,hjmjohnson/ITK,malaterre/ITK,zachary-williamson/ITK,LucasGandel/ITK,malaterre/ITK,atsnyder/ITK,fedral/ITK,fuentesdt/InsightToolkit-dev,biotrump/ITK,Kitware/ITK,Kitware/ITK,BRAINSia/ITK,zachary-williamson/ITK,fbudin69500/ITK,stnava/ITK,jcfr/ITK,biotrump/ITK,Kitware/ITK,LucHermitte/ITK,atsnyder/ITK,fuentesdt/InsightToolkit-dev,BRAINSia/ITK,BRAINSia/ITK,richardbeare/ITK,LucasGandel/ITK,richardbeare/ITK,hinerm/ITK,zachary-williamson/ITK,BRAINSia/ITK,thewtex/ITK,jcfr/ITK,msmolens/ITK,thewtex/ITK,spinicist/ITK,LucasGandel/ITK,jcfr/ITK,BlueBrain/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,fbudin69500/ITK,PlutoniumHeart/ITK,vfonov/ITK,vfonov/ITK,hendradarwin/ITK,LucHermitte/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,blowekamp/ITK,jmerkow/ITK,spinicist/ITK,fedral/ITK,hinerm/ITK,GEHC-Surgery/ITK,hinerm/ITK,malaterre/ITK,fuentesdt/InsightToolkit-dev,heimdali/ITK,biotrump/ITK,thewtex/ITK,eile/ITK,LucHermitte/ITK,blowekamp/ITK,jmerkow/ITK,msmolens/ITK,fedral/ITK,ajjl/ITK,hinerm/ITK,richardbeare/ITK,eile/ITK,vfonov/ITK,jcfr/ITK,vfonov/ITK,eile/ITK,zachary-williamson/ITK,fuentesdt/InsightToolkit-dev,spinicist/ITK,fbudin69500/ITK,Kitware/ITK,malaterre/ITK,ajjl/ITK,spinicist/ITK,vfonov/ITK,malaterre/ITK,stnava/ITK,fbudin69500/ITK,ajjl/ITK,BlueBrain/ITK,fbudin69500/ITK,jmerkow/ITK,PlutoniumHeart/ITK,PlutoniumHeart/ITK,vfonov/ITK,LucasGandel/ITK,fedral/ITK,heimdali/ITK,atsnyder/ITK,LucasGandel/ITK,LucHermitte/ITK,hinerm/ITK,hendradarwin/ITK,stnava/ITK,fedral/ITK,ajjl/ITK,InsightSoftwareConsortium/ITK,spinicist/ITK,BRAINSia/ITK,atsnyder/ITK,biotrump/ITK,hjmjohnson/ITK,jmerkow/ITK,blowekamp/ITK,heimdali/ITK,zachary-williamson/ITK,fedral/ITK,PlutoniumHeart/ITK,heimdali/ITK,GEHC-Surgery/ITK,fedral/ITK,richardbeare/ITK,vfonov/ITK,blowekamp/ITK,BlueBrain/ITK,malaterre/ITK,Kitware/ITK,stnava/ITK,PlutoniumHeart/ITK,ajjl/ITK,LucasGandel/ITK,Kitware/ITK,blowekamp/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,GEHC-Surgery/ITK,hjmjohnson/ITK,spinicist/ITK,heimdali/ITK,msmolens/ITK,jmerkow/ITK,thewtex/ITK,malaterre/ITK,BlueBrain/ITK,GEHC-Surgery/ITK,hjmjohnson/ITK,thewtex/ITK,PlutoniumHeart/ITK,spinicist/ITK,thewtex/ITK,jcfr/ITK,stnava/ITK,vfonov/ITK,GEHC-Surgery/ITK,zachary-williamson/ITK,hendradarwin/ITK,spinicist/ITK,jmerkow/ITK,ajjl/ITK,GEHC-Surgery/ITK,GEHC-Surgery/ITK,fuentesdt/InsightToolkit-dev,fbudin69500/ITK,hinerm/ITK,eile/ITK,blowekamp/ITK,biotrump/ITK,richardbeare/ITK,hjmjohnson/ITK,atsnyder/ITK,richardbeare/ITK