Fix COURSE_PERIOD_SCHOOL_PERIODS Rollover
Responsive anonymous stats
Responsive Grades list
ListOutput header

- clean CSS
- move ListOutput header above search & export
- fix ListOutput header CSS
Responsive GradeBreakdown chart
Display grades according to GRADES_DOES_LETTER_PERCENT
ROLL Gradebook Config's Final Grading Percentages
Responsive student/staff fields preferences
CSS cleaning
WPadmin + Wordpress
Delete x.png & check.png

- replace x.png with x_button.png
- replace check.png with check_button.png
- end IMG html tags