Faster user_info with less API requests

[cadam00]

Hi,

It is usual for user_id to contain duplicated user IDs, as long as the same person is very likely to have taken more than one picture. This can happen especially when the direct output of photo_search is used (column owner). Instead of using the whole sequence of user_id it would be wise to remove duplicates and then merge the result to the initial larger input. So, Flickr API will ask for each one of them only once. What do you think?

Thanks.