msva marginal ui should only list valid certifiers once
The msva marginal ui currently lists the user id for every valid sig. However, if there are multiple sigs from the same valid user id on the key, the user id will be listed multiple times. This is redundant and clutters the interface. The marginal ui should only list each valid certifier uid once.
(from redmine: created on 2010-11-01, closed on 2010-12-20)