CiviCRM Profile should allow creation of new contacts without dupe check

Currently the profile code does a dedupe to ensure that an user cannot create an already existing contact. There is an option to update the contact. We need one more options:

• Always create a new contact.
• Update the first contact found by the dedupe rules
• Throw an error if the contact already exists.

We might want to change the boolean to an option group setting for this functionality. CMS user creation will still return an error if the user already exists, this is fine and acceptable behavior