HCOLL-285 Refactor Stateless client builders, MapInstanceConfig =>

Builder, removed addJsonConverter method from ChronicleMapBuilder

src/main/java/net/openhft/chronicle/set/SetFromMap.java

@@ -60,7 +60,7 @@ class SetFromMap<E> extends AbstractSet<E>
     }
 
     public boolean remove(Object o) {
-        return m.remove(o) == DUMMY_VALUE;
+        return m.remove(o, DUMMY_VALUE);
     }
 
     public boolean add(E e) {
@@ -91,6 +91,8 @@ class SetFromMap<E> extends AbstractSet<E>
         return o == this || s.equals(o);
     }
 
+    // TODO optimize in case of stateless clients -- because bulk ops are optimized on maps
+    // but on key set they delegate to individual element queries => individual remote calls
     public boolean containsAll(Collection<?> c) {
         return s.containsAll(c);
     }