DB: external_uri should take list of values

[eins78]

2 times, columns in both tables keywords and people

• db: migrate schema + data to array
• admin: edit fields support multiple values
• admin: index/show support array of links
• webapp: show pages support array of links

[nadjaweisskopf]

@eins78 Refinement with Philipp, Matus, Thomas and Tashi:
first question: one screenshot is a person, one is a tag
solutions:

1. As good as possible - check URL, split on white space and commas
2. solution from Max
3. Shouldn't we rather introduce meta keys on persons too --> RDF-scheme - think about this solution too

Decide, if only for this field or for all necessary fields.

[nadjaweisskopf]

could be a ticket for Michal - but not very important

[eins78]

finished DB migration and API backwards-compatibilty
6a2e982

[eins78]

finished

• editing in admin ui (people and keywords)
• display list of URIs (people and keywords)
• for people, decorate some known links ("Normdaten", see below)
• test for everything