remove push/pop for fixedpoint objects from API #2249

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/api/java/Fixedpoint.java

@@ -157,25 +157,6 @@ public class Fixedpoint extends Z3Object
         }
     }
 
-    /**
-     * Creates a backtracking point. 
-     * @see #pop
-     **/
-    public void push() {
-        Native.fixedpointPush(getContext().nCtx(), getNativeObject());
-    }
-
-    /**
-     * Backtrack one backtracking point.
-     * Remarks: Note that an exception is thrown if {@code pop} 
-     * is called without a corresponding {@code push}
-     *  
-     * @see #push
-     **/
-    public void pop() {
-        Native.fixedpointPop(getContext().nCtx(), getNativeObject());
-    }
-
     /**
      * Update named rule into in the fixedpoint solver.
      *