Bug fix:
- faces converts strings to long in some dropdown postback situations
[Bug Fix] #387259 Fixes view Files for user ist155393
Merge pull request #22 from diutsu/dev

[Bug Fix] #387259 Fixes view Files for user ist155393
[Minor Change] #381405 Adds option to choose execution year for approvement certificates
Merge pull request #23 from diutsu/master

[Minor Change] #381405 Adds option to choose execution year for approvement certificates
Minor Change: Only show research units for researchers.
Minor Change: add id to thesis export
Deployed HEAD.
Minor change:
- reusing existing methods