Clear all-groups cursor.
Clear all-groups in search and comparison pages.
Change depth of last class for no data row.
Merge pull request #374 from MastodonC/feature/fix-chart-clearing

Clear all-groups cursor.
Fix filtering of a programme resource.
Merge pull request #375 from MastodonC/feature/fix-filtering-for-programme

Fix filtering of a programme resource.
Upgrade core.async.
Merge pull request #376 from MastodonC/feature/upgrade-core-async

Upgrade core.async.
WIP
Use refresh-chan to update status
display names and update frequency
Fix status retrieval.