Grafana-wtf

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- Improve progressbar behavior
- Upgrade required packages to their recent versions

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- Add "--concurrency" option to run multiple requests in
parallel as requested through 2. Thanks, `jangaraj`_.
- Extend non_leaf_nodes with "list" and "links"
- Improve logging

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- Raise the limit for ``search_dashboards()`` to its maximum value (5000).
Thanks, `jangaraj`_.

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Slightly improve the situation with large Grafana installations, see 2.
Thanks, `jangaraj`_.

- Add option ``--cache-ttl`` for controlling the cache expiration time
- Improve error logging when hitting Grafana unauthorized
- Improve performance of search routine

.. _jangaraj: https://github.com/jangaraj

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- Add progress indicator
- Improve logging and reporting

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- Add ``grafana-wtf log`` subcommand for displaying edit history