Merge pull request #880 from dennishendriksen/master

Bug fixes, security improvements and styling updates
Merge pull request #881 from dennishendriksen/master

Fix test + fix security config
moved img to data explorer
Merge pull request #882 from dennishendriksen/master

Feature #862 Sort on variable ID in protocol viewer download
Merge pull request #883 from RoanKanninga/master

moved img to data explorer
bug fix: reset security context after each test class