Reconsider architecture

[nuest]

The current standalone architecture is not well connected to existing "products" of 52°North. Reconsiders this and evaluate a closer integration with

• the Timeseries API (the most reasonable layer, add discovery interfaces and indexed document database)
• the SOS (extend the SOS with discovery endpoints and a high speed search database)
• Esri Geoportal Server (as a catalogue that can also be made handle Sensor Web data)