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
PropertyBinding propBinding = (PropertyBinding) propertyBindings
					.get( i );
			BigDecimal id = propBinding.getID( );
			if ( id != null
					&& propName.equalsIgnoreCase( propBinding.getName( ) )
					&& getElementByID( id.longValue( ) ) == element )
				return propBinding;
		}
		return null;
	}
	/**
	 * Gets all the defined property bindings for the given element. Each one in
	 * the list is instance of <code>PropertyBinding</code>.
	 * 
	 * @param element
	 *            the element to find
	 * @return the property binding list defined for the element
	 */
	public List getPropertyBindings( DesignElement element )
	{
		if ( element == null )
			return Collections.EMPTY_LIST;
		List propertyBindings = getListProperty( this, PROPERTY_BINDINGS_PROP );
		if ( propertyBindings == null )
			return Collections.EMPTY_LIST;
		List result = new ArrayList( );
		for ( int i = 0; i < propertyBindings.size( ); i++ )
		{
			PropertyBinding propBinding = (PropertyBinding) propertyBindings
					.get( i );