Bug 157744 [Regression]GUI has memory leak
Causes by 153732, designer has a regression to hold the report design handle in a hashmap. That causes the report design can not be released.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/TableEditPart.java
* 
	 * @param columnNumber
	 */
	public void insertColumn( int columnNumber )
	{
		insertColumn( -1, columnNumber );
	}
	/**
	 * Inserts a single column at give position.
	 * 
	 * @param relativePos
	 *            The relative position to insert the new column.
	 * @param originColNumber
	 *            The column number of the original column.
	 */
	public void insertColumn( final int relativePos, final int originColNumber )
	{
		final ColumnHandleAdapter adapter = HandleAdapterFactory.getInstance( )
				.getColumnHandleAdapter( getColumn( originColNumber ) );
		try
		{
			getTableAdapter( ).insertColumn( relativePos, originColNumber );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
		}
		Display.getCurrent( ).asyncExec( new Runnable( ) {
			public void run( )
			{