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
}
		return (ElementPropertyDefn) referencableProperties.get( structureName );
	}
	/**
	 * Returns the list of errors accumulated during a batch operation. These
	 * errors can be serious errors or warnings. Each one is the instance of
	 * <code>ErrorDetail</code>.
	 * 
	 * @return the list of errors or warning
	 */
	public List getAllErrors( )
	{
		return ErrorDetail.convertExceptionList( allExceptions );
	}
	/**
	 * Returns the list of exceptions accumulated during a batch operation. Each
	 * one is the instance of <code>Exception</code>.
	 * 
	 * @return the list of exception
	 */
	public List getAllExceptions( )
	{
		return allExceptions;
	}
	/**
	 * Returns the validation executor.
	 * 
	 * @return the validation executor
	 */
	public ValidationExecutor getValidationExecutor( )