COMP: Require at least Python 2.6 for Python wrapping
COMP: Require at least Python 2.6 for Python wrapping

See : http://public.kitware.com/pipermail/community/2014-February/001444.html

I also added a check for the Python executable and library mismatch.

Change-Id: I13927e7339de96e0b7f87f6d76b510c0cdfbe6cc

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