Bug fix: can not invoke super because it will give a cast error,
implementing own logic
Minor change: if the student already has chosen the same affinityCycle,
simply return that registration, instead of an error with no information
Bug Fix: Fixed expression for testing null user.
Bug Fix: overloading methods confuses the renderes and may result in class cast exceptions every once and a while.
Added service to 'dump' enrolment statistics for specified semesters.
Bumped version for release of 3.11.4
Merge branch 'release/3.11.4' into develop
Bumped version for development after release.
Bug fix: preventing NPE
Allow DGES imported students to have custom usernames
Merge pull request #589 from jcarvalho/candidacies

Allow DGES imported students to have custom usernames
Bug Fix: Use suppliers to get a stream so that the singleton method can get a new stream for each time it needs to be evaluated, this avoiding termination exceptions.
Minor change: added 2 more registration declarations to the final pdf,
and updated the instructions to reflect that
Bumped version for release of 3.11.5
Merge branch 'release/3.11.5' into develop
Bumped version for development after release.
Only use username if the person already has a username.