Resolve "Not storing groups for documentations is kind of a problem"

Closes #351 (closed)

changed milestone to /AlekSIS%"[NLnet #6 (closed)] Do integration/final tests with pilot schools"

added part::backend source::customer::kath type::bug workflow::current-todo labels

added 11 commits

• 6d7d1c89...400f4934 - 7 commits from branch master
• eae1c27b - Calculate statistics about participations with lesson events
• 40967ac9 - Add indicator for not counted absences
• d43b44bd - Fix query
• 7faa1dfb - Add print button to coursebook group tab

Compare with previous version

marked this merge request as ready

merged

mentioned in commit 9e24f1ee