BUG: changed some variables involved in shifting to unsigned
BUG: changed some variables involved in shifting to unsigned

fixes clang ubsan error in itkGE4 test:
Modules/IO/GE/src/itkGE4ImageIO.cxx:375:29: runtime error: left shift of negative value -2113929216

Also:
- removed unused #defines
- removed useless casts
- put declarations with initializations.

Change-Id: Iab8d861afcc912934ac0bd7df486950fc59d4174

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