Remove or adjust print messages

firstpass_learner.py

@@ -99,7 +99,7 @@ class FirstpassLearner(Z3LearnerBase):
             print("(unsat)")
             return None
         else:
-            print("(unknown) or timeout!")
+            print(self._solver.reason_unknown())
             return None
 
 

teacher_base.py

@@ -80,8 +80,6 @@ class GurobiTeacherBase(TeacherBase):
             m = self._gp_model
             x = self._old_state
             z = self._percept
-            print('Obj: %g, ObjBound: %g, x: %s, z: %s\n'
-                   % (m.objVal, m.objBound, x.x, z.x))
             return [tuple(x.x) + tuple(z.x)]
         else:
             return []