Bug 197228 Need updaet createdBy info when serialize the module
When open module, designer will pass the property map which contains the createdBy info. this info should be retained by moduleHandle and then be updated and written when doing serialization. Note if this info is null, model should not update it during serialization. This could happen for api users or third-party designer. For BIRT designer, it will guarantee this value always not null.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
*/
	public Library getLibraryWithNamespace( String namespace )
	{
		return getLibraryWithNamespace( namespace,
				IAccessControl.ARBITARY_LEVEL );
	}
	/**
	 * Returns the module with the given namespace. This method checks the
	 * namespace in included libraries within the given depth.
	 * 
	 * @param namespace
	 *            the module namespace
	 * @param level
	 *            the depth of the library
	 * @return the module with the given namespace
	 * 
	 * @see IModuleNameScope
	 */
	public Library getLibraryWithNamespace( String namespace, int level )
	{
		if ( libraries == null )
			return null;
		List list = getLibraries( level );
		Iterator iter = list.iterator( );
		while ( iter.hasNext( ) )
		{
			Library library = (Library) iter.next( );
			if ( library.getNamespace( ).equals( namespace ) )
				return library;
		}