from  Benoît Perrot  <benoit@lrde.epita.fr>

	Factor boolean tasks.
	
	* src/task/boolean_task.hh, src/task/boolean_task.cc:
	* src/task/Makefile.am:
	Distribute new files.
	* src/vm/vm-tasks.hh, src/vm/vm-tasks.cc,
	* src/task/libtask.hh:
	Use boolean tasks.