Bug 187213 Provid a writer to serialize design in document without any white space.
Add a new writer for serialize design in document without any withe space.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
assert struct instanceof Structure;
		IStructure memberStruct = (IStructure) ( (Structure) struct )
				.getLocalProperty( null, (PropertyDefn) struct.getDefn( )
						.getMember( memberName ) );
		if ( memberStruct == null )
			return;
		writer.conditionalStartElement( DesignSchemaConstants.STRUCTURE_TAG );
		writer.attribute( DesignSchemaConstants.NAME_ATTRIB, memberName );
		Iterator iter = structDefn.propertiesIterator( );
		while ( iter.hasNext( ) )
		{
			StructPropertyDefn strcutPropDefn = (StructPropertyDefn) iter
					.next( );
			
			
			writeMember( memberStruct, strcutPropDefn );
		}
		writer.endElement( );
	}
	/**
	 * Writes the structure list of the give property definition for given
	 * design element.
	 * 
	 * @param obj
	 *            the design element to write
	 * @param propName
	 *            the name of the structure list property to write
	 */
	protected void writeStructureList( DesignElement obj, String propName )
	{