Improving group UI see BT#7682
Fixing docs.
Fixing announcements in groups see BT#7682
Fixing group import when there are categories see BT#7682
Minor - format code.
Teacher can see invisible elements during LP construction see BT#7688
Minor - format code.
Fixes big black div see BT#7694
Updating media element lib to version 2.13.2.
Fixing PHP warnings.
Fixing PHP warnings.
Fixing remove_XSS that always has ANONYMOUS even if you're in course.

Now the default value of $user_status is empty, the status is checked
depending of the api_is_allowed_to_edit() function See BT#7311
Minor - adding docs, cleaning code.
Minor - corrections.
Fixing PHP warnings.
Minor - Format code
Additional fix to prevent possible security flaw - see issue #12
Fix issue counting double document size if used in sessions
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
Minor - format code.