exists as long as pod (persistence after restart)

- changed definition of "Node" in roleStageDiscover
- added layer- and node-storage in roleStageDiscover

Removed all code regarding multilayer creation and visualization including unused/deprecated preparations for Porto Meeting.
See branch support/multilayer-graph for original content.

when a transaction failes it gets stored in its own collection
updated requirements.txt

Merge remote-tracking branch 'origin/feature/community-detection-pipeline' into feature/community-detection-pipeline

'rest' to 'routes'

Authentication and business interface