MSC: swap "Name" and "Instant Name"
In the context of MSCs, it makes more sense that port names denote time instant names instead of port names.
In addition if we refer to a (logical architecture) port several times
then it entails that several (MSC) ports have the same name. Not so
good.
On the other hand if we use names to represent time it should not
happen.
(from redmine: issue id 1910, created on 2014-01-30, closed on 2014-07-07)