Fixing PHP warning.
Fixing document creation inside a group.
Adding group id to the function check_visibility_tree(). see BT#7870
Minor - format code.
Adding table TABLE_MAIN_SESSION_COURSE in queries.
Updating japanese variables.
Updating lang vars.
Updating english variables.
Merge remote branch 'upstream/1.9.x' into 1.9.x

Conflicts:
	main/css/default_scorm.css
Fix for calls static function whitout 5 params
Merge pull request #17 from DeEvo/temp_1.9.x

Set default value to params in CourseManager :: get_student_list_from_course_code()
Improving UI and queries see BT#7297
Initialize null params in MySpace :: display_tracking_grade_overview() and update PHPdoc
Merge pull request #18 from DeEvo/temp_1.9.x

Set default value to params in MySpace :: display_tracking_grade_overview()
update css kiddy
update css kiddy chamilo
Merge pull request #244 from aragonc/1.9.x

Merge from @aragonc. Improves tabs classification, fixes a few style bugs and redesigns completely the "kiddy" style.
Merge pull request #239 from diegoe/1.9_template-warnings

admin/settings: Fix undefined variable warnings
Merge pull request #237 from diegoe/1.9_6735_user-list_fixes

1.9.x: Fix unintentional wildcard search on user_list
manual merge