copy content after object has been persisted.
XML-API now renders 500er error if an ojbect's content cannot be found.

(instead of rendering HTML folder view)
CinnamonTikaService now accesses the tika-Metaset directly instead of using setMetadata.

 Fixes #44
Render a proper exception instead of just a string.
Reduced timeouts for database connections in production settings.

Old values would cause Postgres to run out of connection slots if a client created large amounts of requests.
Fixed problems with metasets

Copying an object could result in errors because of
a) CinnamonTikaService calling the setMetadata
b) other code trying to create / delete Metasets before the OSD had been persisted. (And Metasets *need* a valid id)