sponsoring or upload rights: itksnap

[Gert Wollny <gw.fossdev@gmail.com>]

Dear all, 

I've updated itksnap in the team-git to now use libdcmtk-dev. This
upload will also update the dependencies to the latest version of ITK
and gdcm. 

Please sponsor this package or give me upload rights. 

I didn't add closes for #777921 or #789931

  - #777921 actually looks like an ITK bug. I will close this manually 
    once this upload is done. 

  - #789931 relates to arm64 and ITK4 is not available there 
    (hence I will mark this wontfix and downgrade it to normal)

Many thanks, 
Gert