vtk6 is marked for autoremoval from testing

[Debian testing autoremoval watch]

vtk6 6.3.0+dfsg1-2.1 is marked for autoremoval from testing on 2017-02-01

It is affected by these RC bugs:
848785: libvtk6-dev: libvtk6-dev cmake files hardcode nonexisting /usr/lib/libmpi.so
848793: libvtk6-dev: libvtk6-dev cmake files hardcode nonexisting /usr/lib/libmpi.so
848794: libvtk6-dev: libvtk6-dev cmake files hardcode nonexisting /usr/lib/libmpi.so
848799: libvtk6-dev: libvtk6-dev cmake files hardcode nonexisting /usr/lib/libmpi.so
848802: libvtk6-dev: asl: FTBFS: CMakeFiles/Makefile2:217: recipe for target 'src/CMakeFiles/aslvtk.dir/all' failed
848804: libvtk6-dev: gammaray: FTBFS: CMakeFiles/Makefile2:7170: recipe for target 'plugins/objectvisualizer/CMakeFiles/gammaray_objectvisualizer_ui_plugin.dir/all' failed
848808: libvtk6-dev: libvtk6-dev cmake files hardcode nonexisting /usr/lib/libmpi.so
848815: libvtk6-dev: camitk: FTBFS: make[2]: *** [sdk/libraries/core/CMakeFiles/library-camitkcore.dir/all] Error 2