Bug 211703 Support muti-view on report item.
As title described.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/internal/CrosstabReportItemTask.java
* <code>ICrosstabConstants.ROW_AXIS_TYPE</code> or
	 * <code>ICrosstabConstants.COLUMN_AXIS_TYPE</code>. And index is 0-based
	 * integer.
	 * 
	 * @param name
	 *            name of the dimension view to move
	 * @param targetAxisType
	 *            row/column axis type of the move target
	 * @param targetIndex
	 *            the position index of the move target
	 * @throws SemanticException
	 */
	public void pivotDimension( String name, int targetAxisType, int targetIndex )
			throws SemanticException
	{
		DimensionViewHandle dimensionView = crosstab.getDimension( name );
		if ( dimensionView == null )
		{
			crosstab.getLogger( ).log( Level.SEVERE,
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND,
					name );
			throw new CrosstabException( crosstab.getModelHandle( )
					.getElement( ), new String[]{name,
					crosstab.getModelHandle( ).getElement( ).getIdentifier( )},
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND );
		}
		moveDimension( dimensionView, targetAxisType, targetIndex );
	}
	/**
	 * Moves the dimension view with the given name to the target index in the