Bug#750193: Remove *Qt from libvtk6

[Mathieu Malaterre]

Package: libvtk6
Severity: serious
Version: 6.1.0+dfsg-3

Please re-introduct -Qt package from previous package distribution.
Currenly all *Qt libs are shipped within a single libvtk6 package,
this is a very bad idea.

In the past we had to split the Qt package to allow smooth Qt3 -> Qt4
transition. This will be required for Qt4 -> Qt5 transition.