Remove the deprecated sil-plugin
Current status
In AF3, there exist two safety lavel related plugins, namely org.fortiss.af3.sil and org.fortiss.af3.safety.
Proposed change
To avoid confusion and to cleanup inter-plugin dependencies, the plugin org.fortiss.af3.sil should be removed. It is succeeded by org.fortiss.af3.safety. Code-wise, the transition has been performed already. The *.sil plugin is, however, still there for migration purposes. It should be removed in this release, as it is dprecated since the beginning of 2015 already (development phase of af3 pheonix 2.8).
(from redmine: issue id 2387, created on 2015-07-28, closed on 2016-01-18)