==== build 2599 ====
- Fixed bug with limiting users number

==== build 2580 ====
- Fixed some issues regarding upgrading from 3.1.x branch
- Inactive tests results are displayed in statistics 
- Groups can now be sorted based on membership checkbox status
- Questions score in excel exports is displayed correctly
- Excel export lists average score per user
- When seeing a user's lesson as an administrator, professor accounts do not have completed/score columns
- A lesson with all units inactive cannot be "started"
- Fixed a problem when printing trees where starting points are nested deeper than the following ones (i.e. in case their root nodes are deactivated)
- When visiting a lesson with only tests, clicking on the "content" menu link displays the proper unit
- A lesson's users in the professor's settings page can now be sorted by membership checkbox status
- If a user's directory does not exists, it is automatically created
- A user's overall progress for a lesson is now reported correctly, excluding inactive units 
- Multiple Questions single answer and True/False questions' color in done tests does not change when "display right answers" option is false
- Fixed a typo with "EfrontLesssons" class in install script, which appeared at step 4 in case it needed to be repeated