MIS template updates - Multiple selection widget (Normal flow)


**Functionalities implemented:**

1) MIS related scripts updated
 
   - File(s) modified:
   
     1) management/commands/create_schema.py - ```Code added for parsing object_cardinality field of RelationType```

     2) management/commands/data_entry.py - ```Find query updated: group_set field check added```
   
2) Updated: ```models.py```
 
   - DELETED value added to status field's built-in choices
   
   - get_possible_relations() function updated: Check added to fetch only PUBLISHED GRelation(s) 
   
3) Updated: ```templatetags/ndf_tags.py```

   - edit_drawer_widget() function uncommented
     - Check added for special case: To deal with RelationType's object_type values
     
   - html_widget() updated
     - Necessary changes required for multiple-selection widget for RelationTypes
       - New variables passed for template rendering - groupid and node_dict
     
4) Updated: ```views/methods.py```

   - get_drawers() function updated
     - Check added for special case: To deal with RelationType's object_type values
     
   - create_grelation() function redesigned
     - Based on RelationType's cardinality (one-to-one / one-to-many)

     1) If one-to-one
        - Accepts single ObjectId
        - If different document value is passed, the existing one's status changed to 'DELETED'
        - Later on if the DELETED document is again passed, instead of creating new one the existing one's status is changed to 'PUBLISHED'
        - Hence, **no unecessary or redundant creations of GRelation documents**
        
     2) If one-to-many
        - Accepts list of ObjectIds
        - Existing multiple GRelations (if exists) are checked against newly passed list of ObjectIds
          - If matched
            - Removed from newly passed list
            - If PUBLISHED:
              - prints Already existing
            - Else (DELETED)
              - status changed from 'DELETED' to 'PUBLISHED' 
          
          - Else (Not matched)
            - status changed from 'PUBLISHED' to 'DELETED' 

        - If still newly passed list is not empty
          - Remaining one's are created

5) Updated: Following templates & view
 
    1) templates/ndf/html_field_widget.html
   
      - Button added alongside dropdown shown as widget for listing RelationType's object_type values
      - Onclick of button reveal-modal is shown that consists of drawer-widget
      - On closing of reveal-modal, drawer2's values are shifted to outer dropdown
      
    2) templates/ndf/person_create_edit.html
   
      - Styles added to support drawer-widgets look n feel
      - Reveal-modal's close event written
      - Other necessary changes
      
    3) templates/ndf/drawer_widget.html
      
      - Previous commit's changes in this file swapped
      - Necessary changes to support drawer-widget on reveal-modal
      
    4) views/person.py
   
      - Parsing code modified for dob field
      - Necessary changes to support multiple-selection widget for RelationTypes