Bug#953440: libvtk7.1 does not include xdmf3 libraries

[Ruben Di Battista]

Package: libvtk7.1
Version: 7.1.1+dfsg1-12

I’m posting after suggestion from the Ubuntu team (https://answers.launchpad.net/ubuntu/+source/vtk7/+question/689223). 
 recently switched to using xdmf3 instead of xdmf in a library I’m working on, and I started to get this error with libvtk7.1 package: 

```
CMake Error at /usr/lib/cmake/vtk-7.1/vtkModuleAPI.cmake:120 (message):
   Requested modules not available:
    vtkIOXdmf3
```

In my opinion the package should also ship the xdmf3 libraries, since they’re available upstream: https://github.com/Kitware/VTK/tree/v7.1.1/ThirdParty/xdmf3

Some diagnostics: 

```
uname -a:
Linux c7e29d71ba78 4.4.0-174-generic #204-Ubuntu SMP Wed Jan 29 06:41:01
UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -crid:
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic

apt-cache policy vtk7 libvtk7-dev:
vtk7:
  Installed: 7.1.1+dfsg1-2
  Candidate: 7.1.1+dfsg1-2
  Version table:
 *** 7.1.1+dfsg1-2 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
libvtk7-dev:
  Installed: 7.1.1+dfsg1-2
  Candidate: 7.1.1+dfsg1-2
  Version table:
 *** 7.1.1+dfsg1-2 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

```



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