refactor v2 code

Author: karlnicholas

src/main/java/org/hdf5javalib/hdffile/infrastructure/HdfLocalHeapData.java

@@ -70,10 +70,6 @@ public HdfFixedPoint addToHeap(String objectName, HdfDataFile hdfDataFile) {
         return null;
     }
 
-    public void writeToByteChannel(SeekableByteChannel seekableByteChannel, HdfDataFile hdfDataFile) throws IOException {
-        new UnsupportedOperationException("Writing not supported");
-    }
-
     @Override
     public String toString() {
         return "HdfLocalHeapData{" +