Disable screensaver on Linux using Freedesktop's Inhibit command

Signed-off-by: Piotr Galiszewski <pgaliszewski@corp.bluecherry.net>
Bump version to 2.1.6 and update debian changelog

Signed-off-by: Piotr Galiszewski <pgaliszewski@corp.bluecherry.net>
Disable stripping of debug symbols in debian package

Signed-off-by: Piotr Galiszewski <pgaliszewski@corp.bluecherry.net>