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
{
			dropElementID( element );
		}
		Iterator iter = new LevelContentIterator( this, element, 1 );
		while ( iter.hasNext( ) )
		{
			DesignElement innerElement = (DesignElement) iter.next( );
			manageId( innerElement, isAdd );
		}
	}
	/**
	 * Gets the location information of the module.
	 * 
	 * @return the location information of the module
	 */
	public String getLocation( )
	{
		assert systemId != null;
		if ( fileName == null )
			return systemId.toString( );
		return systemId + StringUtil.extractFileNameWithSuffix( fileName );
	}
	/**
	 * @param namespace
	 * @return the included library structure with the given namespace
	 */
	public IncludedLibrary findIncludedLibrary( String namespace )
	{
		List libs = getIncludedLibraries( );
		if ( libs == null )