Curator notes

Addresses https://trello.com/c/lzPFuTs3/262-urgent-notes-field-that-will-display-at-public-interface-and-allow-us-to-post-retraction-notice

If there is metadata in the dryad.curatorNote field, it will be displayed at the top of the Item Summary page.
Looks like a tabs-vs-spaces thing here. This is just a nit, but it looks like a new outer block.