Added ARA icons for the ned files.

Images created by Friedrich Große based on an ant clipart found at
http://openclipart.org/ (concrete author name unknown)
It seems like ARA can now communicate over 802.11 and ARP
Removed old obsolete file
Added missing NED file
Changed the manetTest framework topology and fixed some minor bugs
Removed old test NED modules
Renamed OMNeTARAClient to ARA to be conform with the OMNeT++ protocol naming scheme