Added missing PHPdoc comments
Fixed PHPdoc wrongly documented return param
Improved Observer pattern usability in JTable by adding method getObserverOfClass() and indexing Observers by class-name in JTable
Added method setNewTagsToAdd() to add tags in the JTableObserverTags class
Committing a first solution for content tags batch processing
Streamlined JTableObserverTags method setNewTags() for batch processing
Cleaned-up OOP of Tags batch processing calls