Make file license headers consistent

[jhlegarreta]

There tool contains different versions of license headers, some using the pre-NumFOCUS ITK header, others using different versions specific headers, e.g.:
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeBinaryImageSimilarityMetrics.h
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeBinaryImageSimilarityMetrics.hxx
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeImageSimilarityMetrics.h
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeTrainingMask.hxx
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeTubeFlyThroughImage.h
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/src/Common/tubeIndent.cxx

Some of these files use even different versions for the header and implementation files, e.g.:
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeBinaryImageSimilarityMetrics.h
https://github.com/InsightSoftwareConsortium/ITKTubeTK/blob/7536c6c112e1785cead4d008e8fae5ca8f527f20/include/tubeComputeBinaryImageSimilarityMetrics.hxx

Some even have headers from subversion times:

ITKTubeTK/src/ObjectDocuments/tubeOptionList.h

Line 27 in 508801a

Module: $RCSfile: tubeOptionList.h,v $

License headers should be made consistent.