Current implementation in dev provides registries endpoints with :id but expects full URIs.

• annotations and mappings have URIs minted by the servers, so they have endpoints with /:id
• concordances have endpoint with /:id but their URIs are not minted by the server (but must start with uriBase)
• concepts and schemes have external URIs

Related #237.

Solution: Allow to configure URIs

a) external URIs => no endpoints with /:id
b) baseURI (set to true for baseUrl + type like no done for annotations and mappings) and freely chosen local id
c) UUID (implies baseURI)

{ "mappings": { "create": { "baseURI": true , "idSource": "uuid", "idPattern": "..." } }