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
/**
	 * Identifier of the name space that stores layout elements that appear in
	 * the Body slot.
	 */
	public static final int ELEMENT_NAME_SPACE = 1;
	/**
	 * Identifier for the parameter name space.
	 */
	public static final int PARAMETER_NAME_SPACE = 2;
	/**
	 * Identifier for the data source name space.
	 */
	public static final int DATA_SOURCE_NAME_SPACE = 3;
	/**
	 * Identifier for the data set name space.
	 */
	public static final int DATA_SET_NAME_SPACE = 4;
	/**
	 * Identifier for the master page name space.
	 */
	public static final int PAGE_NAME_SPACE = 5;
	/**
	 * Identifier for the theme name space.
	 */
	public static final int THEME_NAME_SPACE = 6;
	/**
	 * Identifier for the template parameter definition name space.
	 */
	public static final int TEMPLATE_PARAMETER_NAME_SPACE = 7;
	/**