Add (original, large, medium, small) photo URLs for all 1M images

The following modifies all the .tsv files to include the following keys:

* flickr_original_source
* flickr_original_height
* flickr_original_width
* flickr_large_source
* flickr_large_height
* flickr_large_width
* flickr_medium_source
* flickr_medium_height
* flickr_medium_width
* flickr_small_source
* flickr_small_height
* flickr_small_width

Arguably this is overkill and causes unnecessary bloat because:

* Height and widths for only the originals could be included and the others derived as needed
* Height and width could be combined in to a single key
* Individual photo sources could be stored as "parts" (photo farm, photo server, secret, original secret, etc.) thus saving bytes which add up if there are 1M photos

I did not do any of these things since they are all changes that can be applied to the current patch if needed and because they impose a extra layer of understanding and potentially programming in order to use the data dump to fetch an individual photo.

Note: If past experience is any guide there are probably too many changes for a pull request of this size to be merged in the GitHub web application. If this pull request is merged it will likely need to happen from the command line.

Cheers,