Some frequent user views are missing (M)

[wildtayne]

There is currently no view that returns all user activity records (connection and DDL) for all students and/or users. A proposed solution is:

1. [x] ClassDB.getUserActivity(UserName DEFAULT NULL) - NULL returns records for all users
2. [x] ClassDB.getStudentActivity(UseName DEFAULT NULL) - NULL returns records for all students
3. [x] ClassDB.getUserActivityAnon(UserName DEFAULT NULL) - Returns anonymized user records
4. [x] ClassDB.getStudentActivityAnon(UserName DEFAULT NULL) - Returns anonymized student records
5. [x] Remove StudentActivityAll and StudentActivityAnon