Add backward compability in some scripts for python2.5(PlanetLab)
Added the ability to start a single controller (not in bin/xianet yet). Added symbolic link to xia_router_lib.click in etc/click/templates. xconfig.py is more powerful to generate any script we need.
Add scripts to generate a local click script from a global mapping file. Useful for true physical link or layer 2 simulation like GENI, no IP tunneling yet for PlanetLab