Merge branch 'dk-issue-3-concurrent-block-query-rebase' of...

Merge branch 'dk-issue-3-concurrent-block-query-rebase' of gitlab.syncad.com:hive/hivemind into dk-issue-3-concurrent-block-query-rebase

- Merged/rebased current work of @wrona and @dkedzierski onto current
  develop,
- follow.py requires check by @wrona,
- rebase require carefull check and tests.

Note: Not tested!!! Testing in progress!!!