MIS updates - Widgets modification


**Functionalities implemented:**

**1) Widget modified for attributes having data-type as "IS()": Values > 2 - dropdown; and values == 2 - radio buttons**
 
   - If "IS()" data-type found, is_mongokit_radio (boolean variable) is set
     - True: If it's having only two values, then  radio buttons are displayed
     - False: If it's having values (> 2), then dropdown list (select) is displayed
   
   - Files modified:
   
     1) templatetags/ndf_tags.py
     2) templates/ndf/html_field_widget.html

**2) Date widget (only for year) updated**

   - Text-box associated reflects the changed year as soon as it's changed in the widget
   
   - File modified:
   
     1) templates/ndf/person_create_edit.html