Revision 206

OLPC wireless support:
     1.  Add country IE support.
     2.  Fix bug when pairwise key and group key are of different cipher type.
     3.  Workaround AP's dummy WPA IE (Linksys has an extra dummy WPA IE).
     4.  Support both EAPOL versions 1 and 2.
     5.  Join ad-hoc.