MIS update - Student registration (Registration date)


**Functionalities implemented:**

1) **Renamed registration_year to registration_date & updated existing value(s), if any**
 
   - MIS Script updated that does necessary changes (renaming AttributeType and updating value(s) if any)
   
   - Files modified:
   
     1) management/commands/mis_college_group.py
     2) templates/ndf/student_create_edit.html
     3) views/person.py
     4) ATs.csv - proper values reflected