* Updates an existing contact.
* @param basicData contact data
* @return
*/
private String updateExistingContact(ContactSummaryView basicData) {
Contact prevContact = getContact(basicData.getIdentifier());
Contact newContact = prevContact.clone();
prevContact.setRecent(false);
persistenceManager.makePersistent(prevContact);
newContact.setVersion(prevContact.getVersion() + 1);
return KeyFactory.keyToString(persistenceManager.makePersistent(newContact).getKey());
}