Added support for assign 0 to inquryFunction for unknowable states
Added comments for some unknowable states, not existing in Atomspace, nor able to calculate in real time
Made OCPlanningAgent wait longer till PAI processing more info.
Added support for query unknowable state value. and fixed some rules for Einstein puzzle.
Added inquery interface for unknowable state value, which not in Atomspace,can not be calcultated in real time system, only can be found in some planning steps.
Fixed  AtomSpaceUtil::addLink to add links defaultly with TruthValue::TRUE_TV() instead of 0.