[Missions] New Feature: Added a new VERIFICATION MissionState to every
MissionProcess. Added an activity to verify a process, and another
activity to revert the verification.
[Missions] New Feature: Added a VerificiationQueue with the people that
can verify processes. These people can view a list of
verification-pending processes in the Missions front page. They receive
email notifications with the verification-pending processes.
[Missions] New Feature: Added migration code to set old processes
automatically as verified in certain cases.
[Missions] Refactor: The migration of the MissionSystem is now performed
inside a synchronized block with a double check to avoid
StackOverFlowExceptions.