General improvements
- Objects are now always allocated in alphabetical order in the Group Manager. This means that Track 1 will receive the first object, Track 2 will receive the second, etc.
- A Reset Cache-action has been added to the Group Manager. This can be useful if some objects created outside the Group Manager do not appear. Clicking "Reset cache" button, will re-fetch the objects to be allocated in the list.
- Put the actions under a drop-down menu for smaller screens

Bug fixes
- Fixed an issue where sometimes duplicate Activities could be generated in the Activity Manager. This is a difficult issue to reproduce, so this might happen in some rare occasions.
- Fixed an issue where sometimes unrelated names would appear in the Submitters filter in the Submissions list in the Activity Manager.
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