Fix jTET does not support Boolean comparison bug.

jTET does not support Boolean comparison now, no matter it is
Equals or NotEquals. This is caused by the BooleanType is not
included in the array list for the Equals and NotEquals cases
in the getInputTypeForOutput function. We fix this by adding
the BooleanType in the array list.

src/main/java/ca/mcscert/jtet/expression/BinaryOperation.java

@@ -53,7 +53,7 @@ public enum BinaryOperation {
                 return Arrays.asList(new TypeMarker[]{RealType.Type, FixedPointType.TypeMarker});
             case Equals:
             case NotEquals:
-                return Arrays.asList(new TypeMarker[]{RealType.Type, FixedPointType.TypeMarker, EnumerationType.TypeMarker});
+                return Arrays.asList(new TypeMarker[]{BooleanType.Type, RealType.Type, FixedPointType.TypeMarker, EnumerationType.TypeMarker});
         }
         return Arrays.asList(new TypeMarker[]{outputType});
     }