gdevilspie package is not available for 18.04 LTS, but is installable

[Norbert]

Steps to reproduce:
1. Have Ubuntu 18.04 LTS installed
2. Try install gDevilspie

Expected results:
* gDevilspie is available

Actual results:
* gDevilspie is not available

Workaround - install manually with
```
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gnome-python-desktop/python-wnck_2.32.0+dfsg-3_amd64.deb
sudo apt install ./python-wnck_2.32.0+dfsg-3_amd64.deb

wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gdevilspie/gdevilspie_0.5-3.2_all.deb
sudo apt install ./gdevilspie_0.5-3.2_all.deb

```