Geocoded images based upon the node latitude and longitude?

Problem/Motivation

The module does a good job of displaying photos from a particular photostream. Flickr's API also has a feature for finding geocoded photos from a particular latitude and longitude. It would be nice to grab the lat,lon from a particular node and then feed it into the API to display nearby images.

https://www.flickr.com/services/api/flickr.places.findByLatLon.html

If anyone has a suggestion for the best way to do it, I'm happy to contribute time and testing.

User interface changes

Add checkbox to connect with node's geocode.

API changes

Add support for call to FlickrAPI.php.