Setting tag nodeconfig-4.3-7

- decompose PlanetLabConf/sysctl.php into sysctl.conf and
sysctl-ip_forward.php. This is in prep of phasing out the latter
altogether, as enabling ip_forwarding should be something that is
managed by NM.
- PlanetLabConf/ntptickers.php migrated PlanetLabConf/ntp/step-tickers.php
- Added sfa_config.php
- updated ntp server set for .de (german) nodes.
- f12 related changes from Thierry/Baris