QGOV changes

[ThrawnCA]

• Make compatible with Python 3
• Use UTC timestamps internally so we don't have conversion problems
• Delete obsolete archives
• Don't create archival tasks for changes to uploaded files (they get false positives and they don't need to be archived anyway since they're already stored in CKAN)
• Integrate with additional Uploader APIs for downloads and metadata if available (see QGOV CKAN fork for details) to enable integration with alternative storage providers such as ckanext-s3filestore
• Add Flake8 config
• Add Github Actions workflow
• Add more tests
• Move requirements from setup.py to requirements files

[Zharktas]

Let's remove travis configuration completely, it's not really usable anymore. I'll try to review this soonish.

[Zharktas]

I'll add github action workflow as a separate PR today, so that the action is run for this PR too.

[ThrawnCA]

@Zharktas What was wrong with the Github Workflow in this pull request?

[Zharktas]

The only thing wrong with it, is that it's not run as you have no permissions for this repository. Now that there is a existing workflow, the pull requests will trigger the workflow. And i would like python3 support as separate pull request as python3 support itself does nothing unless CKAN 2.9 is supported as well. There is mine #73, which might do the rest of it once I have time to finish it.

[ThrawnCA]

Well, this is just a merge of all changes in our fork except build config specific to our repos. If you want to split it, feel free.

I've merged master to resolve the conflicts, though.

[Zharktas]

I approved running github action, as it is required for the first time. I'm all in for improving archiver itself, it just might take awhile to get it merged :)