Make the module dependent on FlickrAPI

It might be better not to rely on the Flickr module, but to rely on the FlickrAPI module. In the near future, Flickr module will rely on FlickrAPI as well. It's quite easy to change your module to use FlickrAPI. By doing so, you make it future proof (FlickrAPI already implemented OAuth authentication, as the current Flickr authentication that Flickr module uses will not work after Juli 31).

The only two things you need to implement:
- Copy the nsid form from the Flickr module (see this patch)
- Make a small block view function that does something like this:

<?php
$flickr = flickrapi_phpFlickr();
$result = $flickr->people_getPhotosOf($nsid);
// output
?>