Bug#996976: vtk6: Remove vtk6 from the Debian 12

[Sebastiaan Couwenberg]

itksnap is the only remain rdep of vtk6:

  sebastic at coccia:~$ dak rm -Rn vtk6
  Will remove the following packages from unstable:

  libvtk6-dev | 6.3.0+dfsg2-8.1+b1 | amd64, arm64, armel, armhf, i386, 
mips64el, mipsel, ppc64el, s390x
  libvtk6-qt-dev | 6.3.0+dfsg2-8.1+b1 | amd64, arm64, armel, armhf, 
i386, mips64el, mipsel, ppc64el, s390x
   libvtk6.3 | 6.3.0+dfsg2-8.1+b1 | amd64, arm64, armel, armhf, i386, 
mips64el, mipsel, ppc64el, s390x
  libvtk6.3-qt | 6.3.0+dfsg2-8.1+b1 | amd64, arm64, armel, armhf, i386, 
mips64el, mipsel, ppc64el, s390x
        vtk6 | 6.3.0+dfsg2-8.1 | source

  Maintainer: Debian Science Team 
<debian-science-maintainers at lists.alioth.debian.org>

  ------------------- Reason -------------------

  ----------------------------------------------

  Checking reverse dependencies...
  # Broken Depends:
  itksnap: itksnap [amd64 i386]

  # Broken Build-Depends:
  itksnap: libvtk6-dev

  Dependency problem found.

The maintainer has not responded to the RC bugs affecting itksnap 
(#1013152 & #1010549).

itksnap should be removed from Debian along with vtk6, or itksnap should 
be update to 4.0 which claims to support VTK 9:

"
  * Updated library references to ITK 5, VTK 9, and Qt 6
"

https://github.com/pyushkevich/itksnap/blob/v4.0.0/ReleaseNotes.md#version-400

Kind Regards,

Bas

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