EMANE 0.7.1 supported

If you build CORE from source using the nightly SVN snapshot, you can now use EMANE 0.7.1 for more detailed wireless networking. The previous version 0.6.4 is no longer supported. The full list of changes in EMANE 0.7.1 is available here, but if you use EMANE with CORE here are some highlights:

• Location now works with IEEE 802.11abg. Thanks to the new Universal PHY, the 802.11 model now handles location events; if you drag nodes around the canvas, location events are generated and alter node connectivity.
• Rebuild your imn scenarios. Any custom EMANE parameters from your old scenarios need to be removed and re-entered; you can do this by editing the imn file and removing the "custom-config { }" block within the WLAN node definition.