Remove obvious extra debugging trace
Remove obvious extra debugging trace

	* src/uqueue.cc (pop_command): Remove std::cerr output introduced
	by 97fe3e2558fd110715682be0477a03de263e48fb.

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