Add a setting to allow autocomplete province field to return code or full name.

Issue Summary

I ran into a situation using auto_nodetitle where I needed the node name based off of the state. The maintainer of auto_nodetitle, for reasons stated here: http://drupal.org/node/126996, creates the node title during the form validation. This title is generated before the location module converts the full province name into the code to be stored in the database. Because of this, it attempts to title the node with the entire province name. Hitting edit, the code is in the autocomplete field (gathered from the database) rather than the full name. Submitting again renames the node with the code.

In my situation, I found the best solution was to create an administration setting for the location module that let me choose whether I wanted the autocomplete field to return matches based off the full name or the code.

Although this solution solved my issue in an indirect manner, I felt that this might be useful to other people so I'm including the patch.