[INTERNAL] IPN uses now core file system

TODO: VCS still use Eclipse stuff

TODO: temporarily removed execution of WorkspaceRunnables inside
workspace. Readd it again !

Change-Id: Id563b1ae41cb163a8d52f58fc75bd2d025472199
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1932
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>