1. add course access test for newly joined instructor in adminHomePageUiTest
2.found and fixed a typo in studentHomePage
3. fixed related tests

Dev Green
add condition for staging server test
fix testing purpose typo
Account Restore
1.add a method to recover a html-sanitized string to original encoding
2.add a test for above method
3.call this method in instructorCourseStudentListDowloadAction to ensure the display is in correct format
change indentation
Changing delete existing data
Merge branch 'dev' into Speed_up
add test for student list downloading action with special team name
Remove cascading for deleting existing data
Changing
Add persistentAll functions
Fix some bugs
Fix error
Delete data before restoring
Fix questionadd test case
Fix some test cases
Fix test case
Merge branch 'dev' into Section
Change enroll info format