BUG: Changed from VTK_VERSION to VTK_SOURCE_DIR...
BUG: Changed from VTK_VERSION to VTK_SOURCE_DIR...

...to determine if being compiled within VTK or ITK.

Cherry-pick MetaIO commit 93833ed (r2796 aylward, 2010-07-22) to ITK
3.20 release branch.

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