Merge branch 'release/1.6.3' into develop
[DSI Releaser] prepare for next development iteration
[Missions] Minor Change: Corrected a small problem that allowed a
process to be canceled multiple times.
[Missions] Bug Fix: Corrected a problem that cause the
AuthoriseParticipantActivity to be active when it should not.
[DSI Releaser] prepare release v1.6.4
Merge branch 'release/1.6.4'