Add URLs to PDB

[oliverfanderson]

https://www.rcsb.org/

Unfortunately, it does not seem like it will be easy to use an ID within a URL to generate the reports. They seem to assign their own IDs to the 3d structure of the protein and it won't be easy/possible to engineer their IDs from our own. Possibly could use the API to generate a query ID but I don't see what to do with the query ID to generate the results.