BUG: fix itkFormatWarning in Python wrapping
BUG: fix itkFormatWarning in Python wrapping

In Python 3 the itkFormatWarning function takes a named argument `line'.
If named arguments are not handled, this will cause a crash when some
function tries to print a warning (even functions from other libraries:
yes, this is actually breaking other Python packages imported alongside
ITK).

https://docs.python.org/3.6/library/warnings.html#warnings.formatwarning

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