STYLE: minor fix in debug mode and clearer code intent by using macros
STYLE: minor fix in debug mode and clearer code intent by using macros

Change-Id: I4004f9e91d320e7a38bff8e7c7996504f9a4ce5b

fbudin69500/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,malaterre/ITK,vfonov/ITK,Kitware/ITK,spinicist/ITK,LucasGandel/ITK,stnava/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,BRAINSia/ITK,richardbeare/ITK,blowekamp/ITK,stnava/ITK,blowekamp/ITK,Kitware/ITK,richardbeare/ITK,spinicist/ITK,fbudin69500/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,vfonov/ITK,thewtex/ITK,hjmjohnson/ITK,BRAINSia/ITK,thewtex/ITK,fbudin69500/ITK,richardbeare/ITK,malaterre/ITK,richardbeare/ITK,Kitware/ITK,richardbeare/ITK,hjmjohnson/ITK,Kitware/ITK,stnava/ITK,BRAINSia/ITK,thewtex/ITK,malaterre/ITK,hjmjohnson/ITK,Kitware/ITK,LucasGandel/ITK,spinicist/ITK,BRAINSia/ITK,hjmjohnson/ITK,richardbeare/ITK,richardbeare/ITK,vfonov/ITK,malaterre/ITK,stnava/ITK,thewtex/ITK,blowekamp/ITK,fbudin69500/ITK,vfonov/ITK,spinicist/ITK,fbudin69500/ITK,blowekamp/ITK,BRAINSia/ITK,blowekamp/ITK,malaterre/ITK,vfonov/ITK,blowekamp/ITK,spinicist/ITK,hjmjohnson/ITK,vfonov/ITK,LucasGandel/ITK,malaterre/ITK,LucasGandel/ITK,Kitware/ITK,blowekamp/ITK,stnava/ITK,fbudin69500/ITK,Kitware/ITK,fbudin69500/ITK,spinicist/ITK,vfonov/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,spinicist/ITK,spinicist/ITK,malaterre/ITK,malaterre/ITK,stnava/ITK,hjmjohnson/ITK,LucasGandel/ITK,thewtex/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,stnava/ITK,fbudin69500/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,BRAINSia/ITK,spinicist/ITK,hjmjohnson/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK