Add methods that return a list of the tags in use in a certificate
issuer or subject. This means that unknown elements of these fields can
be accessed.
Change-Id: I588989e34f541b1d31cc9e97f5a85d1624ece1b1
Merge-request: 18
Reviewed-by: Peter Hartmann <peter.hartmann@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/1451
