Normalise People (person) names in Index

[jamieu]

Reminder to get this updated in the index, so that the "Summary Name" is the correct way round ("John Smith" not "Smith, John"). Will also need to remove the current workaround in the front-end once implemented.

Only for Mimsy (only when "sub_type":["person"]), AdLib names stay as is.

[jamieu]

Still needs fixing in index :-(

"name": [
        {
          "first_name": "Charles",
          "last_name": "Babbage",
          "primary": true,
          "type": "preferred name",
          "value": "Babbage, Charles"
        },