Rename the flow to flowControl for consistency

Change-Id: Ida3c4ff049f21bd96fd64b41c66787b3961ada5e
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Do not use the deprecated method in the "See also" section

Change-Id: I2a73e9dc19e93c678d803d4aaf2e03c19e7613fb
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Add API for querying the serial number

Thanks go to Massimo Callegari for the initial patch and the request to remind
us again. Thanks also go to Denis and Sergey for working on the windows serial
number parser.

Task-number: QTBUG-31981
Change-Id: I60d882280f481eb99d275e0a9c81da50292b1c61
Reviewed-by: Massimo Callegari <massimocallegari@yahoo.it>
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>