Add hidden desing for hidden Attendances -ref #6880
Ask for login after direct link to a course - ref #6768
Add the possibility to give a user ID to api_is_x() functions
Merge remote-tracking branch 'origin/1.9.x' into 1.9.x
Add hack to show new assignments in work tool on the courses list page - refs BT#7104
Minor - remove error_log
Amend previous commit 4f0a911d5bbc escaping exercise title by counter-escaping when displaying acentuated characters - refs BT#7164
Amend previous commit using api_ functions to avoid encoding issue - refs BT#7164
In question authoring, display Comment editor for all test configuration - ref #6619
Review Fill the blank test allowed char - ref #6810
Display hidden tests in Recycle question menu - ref #6819
Coding convention and replace some api_get_course_id() with api_get_course_int_id()
Minor correction
Coding convention
Call html_entity_decode when editing exercice title

See https://github.com/chamilo/chamilo-lms/commit/4f0a911d5bbc82af92067392929227ff0328fcee#commitcomment-4998599
Inprove transparency in teachers.gif and students.gif files
Course catalog display - ref #6654
fix for showing announcement tags in emails -refs #6803
Improve orphan questions query in coursebuilder to avoid long c_quiz table locking for MyISAM tables - refs BT#7268
Merge remote-tracking branch 'origin/1.9.x' into 1.9.x