Merge branch 'release/3.3.1' into develop
[DSI Releaser] prepare for next development iteration
[scheduler-ui] Minor improvements to the UI
[io] Added ETags and caching information to FileDownloadServlet
Improvements to the Menu Management UI
[core] Bug Fix: User.findByUsername should handle null values
[DSI Releaser] prepare release v3.3.2
Merge branch 'release/3.3.2'