UObject fixes.
UObject fixes.

Detected by trying to link and use bioloid uobjects.

	* src/kernel/uobjects.cc
	  (UWrapNotify::operator()): Pass on the UVar stored in the
	  GenericCallback instead of creating a new one.
	  (send): Implement.

urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi