Submit4dn

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`PR 172: fix bug in get_upload_credentials <https://github.com/4dn-dcic/Submit4DN/pull/172>`_

* Bug fix that was introduced in the previous bug fix for extra_file upload creds that affected regular file upload

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`PR 170: fix bug in extra file upld <https://github.com/4dn-dcic/Submit4DN/pull/170>`_

* Update to allow extra_files to be uploaded even if the regular file was already uploaded (which was previously stymied by permission denied for POST to get extracreds)

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`PR 161: update error report <https://github.com/4dn-dcic/Submit4DN/pull/169>`_

* Updated 'error_report' function to handle additional output on validation exceptions due to fourfront schema version update
* added some additional test cases for this
* increased allowed line lenght in .flake8
* updated lock file with updated version of dcicutils

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Added/modified config files:

* ``.flake8``

* declare expected line length, etc.

* ``pytest.ini``

* Declare mark keywords (``pytest.mark.xxx``)

* ``Makefile``

* Add targets ``clear-poetry-cache``, ``lint``, ``tag-and-push``
* Make test target exclude ``pytest.mark.ftp``
* Load (pinned) ``poetry 1.3.2``

* ``pyproject.toml``

* update library versions, including ``poetry_core``.

* ``scripts/tag-and-push``

* supports make target ``tag-and-push``

* ``tests/`` and ``wranglertools/``

* misc PEP8

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* dependencies update - update lock file to resolve dependabot alerts

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* update to ubuntu version 20.04 in github workflows