Bug 153853 [Regression]The bound column names must be unique within the entire table.
Regression case Regression_136421(under org.eclipse.birt.report.tests.model) failed. Expected result: Model will avoid adding a duplicate bound column name within a table.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* already is included directly or indirectly(that is, the reload path could
	 * be the path of grandson of this module), reload it. If the library is not
	 * included, exception will be thrown.
	 * <p>
	 * Call this method cautiously ONLY on the condition that the library file
	 * is REALLY changed outside. After reload successfully, the command stack
	 * is cleared.
	 * 
	 * @param reloadPath
	 *            this is supposed to be an absolute path, not in url form.
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list. Or it maybe
	 *             because that the given library is not found in the design. Or
	 *             that the library has descedents in the current module
	 * @throws DesignFileException
	 *             if the library file is not found, or has fatal error.
	 */
	public void reloadLibrary( String reloadPath ) throws SemanticException,
			DesignFileException
	{
		if ( StringUtil.isEmpty( reloadPath ) )
			return;
		String path = null;
		try
		{
			path = new File( reloadPath ).toURL( ).toString( );
		}
		catch ( MalformedURLException e )
		{