AbstractDatabaseObjectAction::setObjects() does not set the objectIDs
remove unnecessary code

getComment() returns always null if the comment is invalid, so it mustn't be checked
remove unnecessary code
Add some nice documentation.
Merge pull request #1709 from NetzwergX/2.1-doc-virtual-session

Add some nice documentation.
Updated virtual session implementation and added option to disable it
Added missing auto increment
Add pagination for like details
Updating minified JavaScript files
Fixed updating of virtual sessions and added removal of expired ones
Fixed multiple issues
Added stat rebuild worker
Support undeletable ModerationQueue items
Multiple stat page improvements
Merge branch 'master' of github.com:WoltLab/WCF
Improved session handling, added changeUserVirtual()

Instead of altering changeUser(), I've added changeUserVirtual() (and reverted the original method), because all these numerous different cases would have caused the method to be a nightmare.
Merge branch 'master' of github.com:WoltLab/WCF
Improved package update
Fixed broken user id
Merge branch '2.0'