Remove duplicate tag caused by typo in spec: http://www.asmail.be/msg0055321032.html
flake8
Correct duplicate EXIF tags: http://www.exiv2.org/tags.html
flake8
Correct the correction: RelatedImageWidth=0x1001, RelatedImageLength=0x1002
Merge pull request #875 from hugovk/tifftags

Correct duplicate EXIF and TIFF tags