OpenAtlas

Like discussed in the last developer meeting to counter possible performance issues for projects with big data sets we will try out the approach using autocomplete fields.
Advantage would be that data is only loaded when typing into respective fields instead loading data tables for all fields every time.

Because this is experimental we will keep it optional and configurable in the profile to use this approach.
One good suggestion from Stefan (Probst) was to not limit the results but make them "endless" scroll-able. We could try this out with already existing GeoNames and Wikidata fields.