MSC: Modalities for time info in MSCs
Like messages, time constraints can be equipped with a modality stating whether they can or should appear.
(from redmine: issue id 1895, created on 2014-01-21, closed on 2015-01-12)
- Relations:
- relates #1855 (closed)
- relates #1860 (closed)
- relates #1825 (closed)