ref #7854: fix saving problem
ref #7854: add max visible items for drop down in distribution editor
ref #7854: do not create new distribution without status
ref #7854: minor
ref #7854: improve handling of selection changes in distribution editor
ref #7854: fix problems in distribution editor
ref #7854: continue session handling in distribution editor
ref #7854: session handling in distribution editor
ref #7854 Implement NatTable for distribution editor