Bug#846040: virtual/meta package for vtk

[128 at gmx.us]

Package: vtk6
Version: 6.3.0

This is not a bug but a wishlist item for this package. It would be nice to have
a virtual/meta package that automatically links to the latest version of the
package. Having a package named vtk which links to vtk6 now and vtk7 in the
future will make transitions easier. Below is the link to a package that already
implements this.

https://packages.debian.org/stretch/petsc-dev

Thanks