Some of the Object::equals now are const correct.

There's more to do.

Why make this const-correct, instead of ditch it?  Because whatever
I replace it with has to be ready for const correctness.

lout/container.hh

@@ -242,7 +242,7 @@ public:
    List(bool ownerOfObjects);
    ~List();
 
-   bool equals(Object *other);
+   bool equals(const Object *other) const override;
    int hashValue();
 
    int size ();
@@ -451,8 +451,8 @@ public:
    Collection () { this->base = NULL; }
    ~Collection () { if (this->base) delete this->base; }
 
-   bool equals(Object *other)
-   { return this->base->equals (((Collection<T>*)other)->base); }
+   bool equals(const Object *other) const override
+   { return this->base->equals (((const Collection<T>*)other)->base); }
 
    int hashValue() { return this->base->hashValue (); }