deepcopy for EUI fails

[tubaman]

attempting to do a deepcopy on EUI fails with

/usr/lib/python2.7/copy.pyc in _reconstruct(x, info, deep, memo)
    341                 slotstate = None
    342             if state is not None:
--> 343                 y.__dict__.update(state)
    344             if slotstate is not None:
    345                 for key, value in slotstate.iteritems():

AttributeError: 'NoneType' object has no attribute 'update'

[drkjam]

Fixed on trunk. Will form part of release 0.7.8