Ckanext-versioned-datastore

Fix

- increase ttl to 300s
- add cachetools to dependencies
- cache status report functions for 300s

Fix

- increase status tolerance for queue length
- remove hacky queue length estimate

Feature

- add (optional) integration with ckanext-status

Fix

- use (un)available instead of (dis)connected

Feature

- remove empty groups from multisearch query when running search
- convert single-item OR groups to AND when running search

Fix

- sort on version rather than date modified

Refactor

- move normalisation methods into schema.normalise step

Tests

- add tests for query normalisation utils

Feature

- **downloads**: skip empty extension rows